0000912562-21-000007 | 10-K | XBRL Viewer

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Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2020	Feb. 24, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	0-22462
Entity Registrant Name	GIBRALTAR INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1445150
Entity Address, Address Line One	3556 Lake Shore Road
Entity Address, Address Line Two	P.O. Box 2028
Entity Address, City or Town	Buffalo ,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14219-0228
City Area Code	716
Local Phone Number	826-6500
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	ROCK
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1.5
Entity Common Stock, Shares Outstanding		32,570,961
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s Definitive Proxy Statement to be filed for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000912562

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales:	$ 1,032,578	$ 898,233	$ 837,097
Cost of sales	776,235	678,336	626,171
Gross profit	256,343	219,897	210,926
Selling, general, and administrative expense	149,153	139,085	128,233
Intangible asset impairment	0	0	1,552
Income from operations	107,190	80,812	81,141
Interest expense, net	703	2,323	10,709
Other (income) expense	(1,272)	408	3,309
Income before taxes	107,759	78,081	67,123
Provision for income taxes	24,468	18,153	13,011
Income from continuing operations	83,291	59,928	54,112
Discontinued operations:
(Loss) income before taxes	(16,602)	6,682	12,822
Provision for income taxes	2,123	1,519	3,125
(Loss) income from discontinued operations	(18,725)	5,163	9,697
Net income	$ 64,566	$ 65,091	$ 63,809
Net earnings per share – Basic:
Income from continuing operations (in dollars per share)	$ 2.55	$ 1.85	$ 1.69
(Loss) income from discontinued operations (in dollars per share)	(0.57)	0.16	0.31
Net income (in dollars per share)	$ 1.98	$ 2.01	$ 2.00
Weighted average shares outstanding – Basic (in shares)	32,664	32,389	31,979
Net earnings per share – Diluted:
Income from continuing operations (in dollars per share)	$ 2.53	$ 1.83	$ 1.66
(Loss) income from discontinued operations (in dollars per share)	(0.57)	0.16	0.30
Net income (in dollars per share)	$ 1.96	$ 1.99	$ 1.96
Weighted average shares outstanding – Diluted (in shares)	32,918	32,722	32,534

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 64,566	$ 65,091	$ 63,809
Other comprehensive income (loss):
Foreign currency translation adjustment	3,301	1,766	(3,241)
Cumulative effect of accounting change	0	0	(350)
Adjustment to pension and post-retirement benefit liability, net of tax	(371)	77	723
Other comprehensive income (loss)	2,930	1,843	(2,868)
Total comprehensive income	$ 67,496	$ 66,934	$ 60,941

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 32,054	$ 191,363
Accounts receivable, net of allowance of $3,529 and $5,951	197,990	133,895
Inventories, net	98,307	61,957
Prepaid expenses and other current assets	19,671	18,959
Assets of discontinued operations	77,438	30,928
Total current assets	425,460	437,102
Property, plant, and equipment, net	89,562	78,152
Operating lease assets	25,229	21,201
Goodwill	514,279	307,355
Acquired intangibles	156,365	76,734
Other assets	1,599	1,980
Assets of discontinued operations	0	61,926
Total assets	1,212,494	984,450
Current liabilities:
Accounts payable	134,738	72,628
Accrued expenses	83,505	86,597
Billings in excess of cost	34,702	47,598
Liabilities of discontinued operations	49,295	22,374
Total current liabilities	302,240	229,197
Long-term debt	85,636	0
Deferred income taxes	39,057	35,404
Non-current operating lease liabilities	17,730	14,943
Other non-current liabilities	24,026	21,272
Liabilities of discontinued operations	0	9,670
Shareholders’ equity:
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding	0	0
Common stock, $0.01 par value; authorized 50,000 shares; 33,568 and 33,192 shares issued in 2020 and 2019	336	332
Additional paid-in capital	304,870	295,582
Retained earnings	469,943	405,668
Accumulated other comprehensive loss	(2,461)	(5,391)
Cost of 1,028 and 906 common shares held in treasury in 2020 and 2019	(28,883)	(22,227)
Total shareholders’ equity	743,805	673,964
Total liabilities and shareholders' equity	$ 1,212,494	$ 984,450
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 3,529	$ 5,951
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	33,568,000	33,192,000
Treasury stock, shares (in shares)	1,028,000	906,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income	$ 64,566	$ 65,091	$ 63,809
(Loss) income from discontinued operations	(18,725)	5,163	9,697
Income from continuing operations	83,291	59,928	54,112
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,915	17,557	17,439
Intangible asset impairment	0	0	1,552
Gain on sale of business	(1,881)	0	0
Stock compensation expense	8,173	12,570	9,189
Exit activity costs, non-cash	493	408	1,344
Provision for deferred income taxes	3,786	4,120	4,725
Other, net	1,944	5,399	1,759
Changes in operating assets and liabilities (excluding the effects of acquisitions):
Accounts receivable	2,277	(11,256)	9,665
Inventories	(5,719)	14,272	(12,322)
Other current assets and other assets	5,467	(9,306)	38
Accounts payable	(1,160)	4,804	(5,491)
Accrued expenses and other non-current liabilities	(44,570)	14,040	2,351
Net cash provided by operating activities of continuing operations	73,016	112,536	84,361
Net cash provided by operating activities of discontinued operations	16,088	17,399	13,184
Net cash provided by operating activities	89,104	129,935	97,545
Cash Flows from Investing Activities
Purchases of property, plant, and equipment	(13,068)	(8,776)	(10,368)
Acquisitions, net of cash acquired	(313,686)	(8,595)	(5,241)
Net proceeds from sale of property and equipment	77	92	348
Net proceeds from sale of business	2,000	0	0
Net cash used in investing activities of continuing operations	(324,677)	(17,279)	(15,261)
Net cash (used in) provided by investing activities of discontinued operations	(2,033)	(2,394)	712
Net cash used in investing activities	(326,710)	(19,673)	(14,549)
Cash Flows from Financing Activities
Long-term debt payments	0	(212,000)	(400)
Proceeds from long-term debt	85,000	0	0
Payment of debt issuance costs	0	(1,235)	0
Purchase of treasury stock at market prices	(6,656)	(4,305)	(7,165)
Net proceeds from issuance of common stock	1,119	490	1,385
Net cash provided by (used in) financing activities	79,463	(217,050)	(6,180)
Effect of exchange rate changes on cash	(1,166)	1,145	(2,090)
Net (decrease) increase in cash and cash equivalents	(159,309)	(105,643)	74,726
Cash and cash equivalents at beginning of year	191,363	297,006	222,280
Cash and cash equivalents at end of year	$ 32,054	$ 191,363	$ 297,006

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock
Balance, shares at Dec. 31, 2017			32,332,000						615,000
Balance at Dec. 31, 2017	$ 531,719	$ 274	$ 323	$ 271,957	$ 274,562	$ 624	$ (4,366)	$ (350)	$ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,809				63,809
Foreign currency translation adjustment	(3,241)						(3,241)
Adjustment to post-retirement healthcare benefit liability, net of taxes	723						723
Stock compensation expense	9,189			9,189
Net settlement of restricted stock units, shares			460,000						181,000
Net settlement of restricted stock units	$ (7,165)		$ 5	(5)					$ (7,165)
Issuance of restricted stock, shares			7,000
Stock options exercised, shares	87,907		88,000
Stock options exercised	$ 1,385			1,384
Balance, shares at Dec. 31, 2018			32,887,000						796,000
Balance at Dec. 31, 2018	596,693	1,582	$ 329	282,525	338,995	1,582	(7,234)		$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,091				65,091
Foreign currency translation adjustment	1,766						1,766
Adjustment to post-retirement healthcare benefit liability, net of taxes	77						77
Stock compensation expense	$ 12,570			12,570
Accounting standards update	us-gaap:AccountingStandardsUpdate201602Member
Net settlement of restricted stock units, shares			255,000						110,000
Net settlement of restricted stock units	$ (4,305)		$ 3	(3)					$ (4,305)
Issuance of restricted stock, shares			8,000
Stock options exercised, shares			42,000
Stock options exercised	490			490
Balance, shares at Dec. 31, 2019			33,192,000						906,000
Balance at Dec. 31, 2019	673,964	$ (291)	$ 332	295,582	405,668	$ (291)	(5,391)		$ (22,227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64,566				64,566
Foreign currency translation adjustment	3,301						3,301
Adjustment to post-retirement healthcare benefit liability, net of taxes	(371)						(371)
Stock compensation expense	$ 8,173			8,173
Accounting standards update	us-gaap:AccountingStandardsUpdate201613Member
Net settlement of restricted stock units, shares			296,000						122,000
Net settlement of restricted stock units	$ (6,656)		$ 4	(4)					$ (6,656)
Issuance of restricted stock, shares			4,000
Stock options exercised, shares	75,909		76,000
Stock options exercised	$ 1,119			1,119
Balance, shares at Dec. 31, 2020			33,568,000						1,028,000
Balance at Dec. 31, 2020	$ 743,805		$ 336	$ 304,870	$ 469,943		$ (2,461)		$ (28,883)

Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Minimum pension and post retirement benefit plan adjustments, net of taxes	$ 116	$ 24	$ 225

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of consolidation

The consolidated financial statements include the accounts of Gibraltar Industries, Inc. and subsidiaries (the "Company"). All intercompany accounts and transactions have been eliminated in consolidation.

Use of estimates

The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

Revenue recognition

Revenue is recognized when, or as, the Company transfers control of promised products or service to a customer in an amount that reflects the consideration the Company expects to be entitled in exchange for transferring those products or service.

Performance obligations satisfied at a point in time and significant judgments

The majority of the Company's revenue from contracts with customers is recognized when the Company transfers control of the promised product at a point in time, which is determined when the customer has legal title and the significant risks and rewards of ownership of the asset, and the Company has a present right to payment for the product. These contracts with customers include promised products, which are generally capable of being distinct and accounted for as separate performance obligations. Accordingly, the Company allocates the transaction price, which is generally the quoted price per terms of the contract and the consideration the Company expects to receive, to each performance obligation in an amount based on an observable price of the products as the Company frequently sells these products separately in similar circumstances and to similar customers. These products are generally sold with rights of return and these contracts may provide other credits or incentives, which are accounted for as variable consideration. Variable consideration is estimated at the most likely amount to predict the consideration to which the Company will be entitled, and only to the extent it is probable that a subsequent change in estimate will not result in a significant revenue reversal when estimating the amount of revenue to recognize. Sales returns, allowances, and customer incentives, including rebates, are treated as reductions to the sales transaction price and based largely on an assessment of all information (i.e., historical, current and forecasted) that is reasonably available to the Company, and estimated at contract inception and updated at the end of each reporting period as additional information becomes available.

Performance obligations satisfied over time and significant judgments

For a contract to construct an asset that the customer controls as it is being created or enhanced, or a promise to provide a product that has no alternative use to the Company and the Company has enforceable rights to payment, the Company recognizes revenue over time. For the contracts to construct a certain asset, the Company determines that the customer controls the asset while it is being constructed. For the contracts for products that have no alternative use and for which the Company has an enforceable right to payment, the Company identifies these products as products that are not a standard inventory item or the Company cannot readily direct the product to another customer for use without incurring a significant economic loss, or significant costs to rework the product.

When the promised products and services are to construct a certain asset that the customer controls, the entire contract is accounted for as one performance obligation. The Company determines the transaction price for each contract based on the consideration the Company expects to receive for the promised products and services under the entire contract, which is generally the stated contract price based on an expected cost plus a margin.

When the promised products do not have an alternative use to the Company, and the Company has enforceable rights to payment, the transaction price is determined for each contract based on the consideration the Company expects to receive for the promised products under the contract and is generally the stated contract price based on

an expected cost plus a margin for each performance obligation. These promised products are generally capable of being distinct and accounted for as separate performance obligations.

For the above contracts with customers with respect to which the Company satisfies a performance obligation over time, the Company recognizes revenue based on the extent of progress towards completion of the performance obligation. The cost-to-cost measure of progress best depicts the transfer of control to the customer which occurs as the Company incurs costs on the contract as the incurred costs are proportionate to the Company's progress in satisfying the performance obligation. Under the cost-to-cost measure of progress, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Revenues are recognized proportionally as costs are incurred. Costs to fulfill a contract include all direct costs related to contract performance. Selling and administrative expenses are charged to operations as incurred. Provision for loss on an uncompleted performance obligation is recognized in the period in which such loss is determined.

The Company regularly reviews the progress and performance of the performance obligation recognized over time under the cost-to-cost method. Any adjustments to net sales, cost of sales, and the related impact to operating income are recognized as necessary in the period they become known. Changes in estimates of net sales, cost of sales, and the related impact to operating income are recognized on a cumulative catch-up basis, which recognizes in the current period the cumulative effect of the changes on current or prior periods based on a performance obligation's cost-to-cost measure of progress.

The Company also recognizes revenues from services contracts over time. For these contracts, the transaction price is determined for each contract based on the consideration the Company expects to receive for the promised service under the contract, which generally is the stated contract price. In order to estimate the standalone selling price of the performance obligation, the Company evaluates the market in which the promised service is sold and estimates the price that customers in the market would be willing to pay. Further, the Company recognizes revenue over time during the term of the agreement as the customer is simultaneously receiving and consuming the benefits provided throughout the Company's performance. Therefore due to control transferring over time, the Company recognizes revenue on a straight-line basis throughout the contract period.

Contract assets and contract liabilities

Costs in excess of billings includes unbilled amounts resulting from revenues under contracts with customers that are satisfied over time and when the cost-to-cost measurement method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the customer, and right to payment is not just subject to the passage of time. Amounts do not exceed their net realizable value. Costs in excess of billings are classified as current assets and are reported net of contract billings on a contract-by-contract basis at the end of each reporting period.

Billings in excess of cost includes billings in excess of revenue recognized and deferred revenue, which includes advanced payments, up-front payments, and progress billing payments. Billings in excess of cost are reported net of contract cost on a contract-by-contract basis at the end of each reporting period and are classified as current liabilities. To determine the revenue recognized in the period from the beginning balance of billings in excess of cost, the contract liability as of the beginning of the period is recognized as revenue on a contract by contract basis when the Company incurs costs to satisfy the performance obligation related to the individual contract. Once the beginning contract liability balance for an individual contract has been fully recognized as revenue, any additional payments received in the period are recognized as revenue once the related costs have been incurred.

Unearned revenue relates to payments received in advance of performance under the contract and is recognized when the Company performs under the contract. Unearned revenue is presented within accrued expenses in the Company's consolidated balance sheets.

Costs to obtain a contract with a customer

The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the Company expects the benefit of those costs to be longer than one year. If the amortization period of the asset is one year or less, the Company recognizes the incremental costs of obtaining a contract as an expense when incurred. These incremental costs include, but are not limited to, sales commissions incurred to obtain a contract with a customer.

Cash and cash equivalents

All highly liquid investments with a maturity of three months or less are considered cash equivalents.

Accounts receivable and allowance for doubtful accounts and contract assets

Accounts receivable are composed of trade and contract receivables recorded at either the invoiced amount or costs in excess of billings, are expected to be collected within one year, and do not bear interest.

The Company’s expected loss allowance methodology for accounts receivable and costs in excess of billings (collectively "accounts receivable") is developed using historical collection experience, current and future economic and market conditions, and a review of the current status of customers' accounts receivables. The Company is exposed to credit losses through sales of products and services. Due to the short-term nature of such accounts receivable, the estimated amount of accounts receivable that may not be collected is based on aging of the accounts receivable balances. Additionally, specific allowance amounts are established to record the appropriate provision for customers that no longer share risk characteristics similar with other accounts receivable. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of customers' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible after all means of collection have been exhausted and the potential for recovery is considered remote.

Estimates are used to determine the allowance. These estimates are based on assessment of anticipated payment and all other historical, current and future information that is reasonably available.

The following table summarizes activity recorded within the allowance for doubtful accounts and contract assets balances for the years ended December 31 (in thousands):


	2020		2019		2018
Beginning balance	$	5,951	$	6,170	$	5,599
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings at January 1, 2020	385		—		—
Bad debt expense, net of recoveries	1,321		2,577		1,308
Accounts written off against allowance and other adjustments	(4,128)		(2,796)		(737)
Ending balance	$	3,529	$	5,951	$	6,170

Concentrations of credit risk in accounts receivable are limited to those from significant customers that are believed to be financially sound. As of December 31, 2020 and 2019, the Company's most significant customer is a home improvement retailer. The home improvement retailer purchases from the Residential Products and the Renewable Energy and Conservation segments. Accounts receivable as a percentage of consolidated accounts receivable from the home improvement retailer was 11% and 15% as of December 31, 2020 and 2019, respectively.

Net sales to the home improvement retailer as a percentage of consolidated net sales were 14% in each of the years ended December 31, 2020, 2019 and 2018, with the majority of those sales within the Company's Residential Products segment.

Inventories

Inventories are valued at the lower of cost, determined using the first-in, first-out method, or net realizable value. Shipping and handling costs are recognized as a component of cost of sales.

Property, plant, and equipment

Property, plant, and equipment are stated at cost and depreciated over their estimated useful lives using the straight-line method. Interest is capitalized in connection with construction of qualified assets. Expenditures that exceed an established dollar threshold and that extend the useful lives of assets are capitalized, while repair and maintenance costs are expensed as incurred. The estimated useful lives of land improvements, buildings, and building improvements are 15 to 40 years, while the estimated useful lives for machinery and equipment are 3 to 20 years.

The table below sets forth the depreciation expense recognized during the years ended December 31 (in thousands):


	2020		2019		2018
Depreciation expense	$	11,252	$	10,666	$	10,249

Acquisition related assets and liabilities

Accounting for the acquisition of a business as a purchase transaction requires an allocation of the purchase price to the assets acquired and the liabilities assumed in the transaction at their respective estimated fair values. The most complex estimations of individual fair values are those involving long-lived assets, such as property, plant, and equipment and intangible assets. The Company uses all available information to make these fair value determinations and engages independent valuation specialists to assist in the fair value determination of the acquired long-lived assets.

Goodwill and other intangible assets

The Company tests goodwill for impairment at the reporting unit level on an annual basis at October 31, or more frequently if an event occurs, or circumstances change, that indicate that the fair value of a reporting unit could be below its carrying value. The reporting units are at the component level, or one level below the operating segment level. Goodwill is assigned to each reporting unit as of the date the reporting unit is acquired and based upon the expected synergies of the acquisition.

The Company may elect to perform a qualitative assessment that considers economic, industry and company-specific factors for some or all of our selected reporting units. If, after completing the assessment, it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, the Company proceeds to a quantitative test. The Company may also elect to perform a quantitative test instead of a qualitative test for any or all of the Company's reporting units.

The quantitative impairment test consists of comparing the fair value of a reporting unit, determined using two valuation techniques, to its carrying value. If the carrying value of the reporting unit exceeds its fair value, goodwill is considered impaired, and a loss measured by the excess of the carrying value of the reporting unit over the fair value of the reporting unit must be recorded.

The Company also tests its indefinite-lived intangible assets for impairment on an annual basis as of October 31, or more frequently if an event occurs, or circumstances change, that indicate that the fair value of an indefinite-lived intangible asset could be below its carrying value. The impairment test consists of comparing the fair value of the indefinite-lived intangible asset, determined using discounted cash flows on a relief-from-royalty basis, with its carrying amount. An impairment loss would be recognized for the carrying amount in excess of its fair value. Acquired identifiable intangible assets are recorded at cost. Identifiable intangible assets with finite useful lives are amortized over their estimated useful lives.

Impairment of long-lived assets

Long-lived assets, including acquired identifiable intangible assets with finite useful lives, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of those assets may not be recoverable. In specific situations, when the Company has selected individual assets to be sold or scrapped, the Company obtains market value data for those specific assets and measures and records the impairment loss based on such data. Otherwise, the Company uses undiscounted cash flows to determine whether impairment exists and measures any impairment loss by approximating fair value using acceptable valuation techniques, including discounted cash flow models and third-party appraisals. While the Company did not recognize any impairment charges related to intangible assets and other long-lived assets during the years ended December 31, 2020 and 2019, impairment charges related to intangible assets and other long-lived assets were recognized during the year ended December 31, 2018. Several of these impairment charges related to exit activities during the year ended December 31, 2018, as described in Note 15 of the consolidated financial statements.

Leases

The Company determines if an agreement is, or contains, a lease at the inception of the agreement. At lease commencement, the Company recognizes a right-of-use asset and a lease liability for leases with terms greater than twelve months. The initial lease liability is recognized at the present value of remaining lease payments over the lease term. Leases with an initial term of twelve months or less are not recorded on the Company's

consolidated balance sheet. The Company recognizes lease expense for operating leases on a straight-line basis over the lease term. The Company combines lease and non-lease components, such as common area maintenance costs, in calculating the related asset and lease liabilities for all underlying asset groups. Operating lease cost is included in income from operations and includes short-term leases and variable lease costs which are immaterial.

Deferred charges

Deferred charges associated with initial costs incurred to enter into new debt arrangements are included in other assets and are amortized as a part of interest expense over the terms of the associated debt agreements.

Advertising

The Company expenses advertising costs as incurred. For the years ended December 31, 2020, 2019 and 2018, advertising costs were $7.2 million, $5.7 million, and $5.0 million, respectively.

Foreign currency transactions and translation

The assets and liabilities of the Company’s foreign subsidiaries are translated into U.S. dollars at the rate of exchange in effect at the balance sheet date. Income and expense items are translated at the average exchange rates prevailing during the period.

Income taxes

The provision for income taxes is determined using the asset and liability approach. Under this approach, deferred income taxes represent the expected future tax consequences of temporary differences between the carrying amounts and tax basis of assets and liabilities. The Company records a valuation allowance to reduce deferred tax assets when uncertainty exists regarding their realization.

Equity-based compensation

The Company measures the cost of equity-based compensation based on grant date fair value and recognizes the cost over the period in which the employee is required to provide service in exchange for the award reduced by forfeitures. Equity-based compensation consists of grants of stock options, deferred stock units, common stock, restricted stock units, and performance stock units. Equity-based compensation expense is included as a component of selling, general, and administrative expenses.

Recent accounting pronouncements

Recent Accounting Pronouncements Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2016-13

Financial Instruments - Credit Losses

(Topic 326)

The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates.

The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the modified retrospective approach through a cumulative-effect adjustment to retained earnings of $291,000, net of $96,000 of income taxes, on the opening consolidated balance sheet as of January 1, 2020. The Company's financial assets that are in the scope of the standard are contract assets and accounts receivables which are short-term in nature. Additionally, the Company has identified and implemented appropriate changes to the Company's business processes, policies and internal controls to support reporting and disclosures.

Date of adoption: Q1 2020

ASU 2018-15

Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract

The amendments in this update require an entity to apply the same requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract as the entity would for implementation costs incurred to develop or obtain internal-use software. The accounting for the service element is not affected by the amendments in this update.

The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the prospective method of adoption, and the adoption did not have a material impact to the Company's financial statements.

Date of adoption: Q1 2020

Recent Accounting Pronouncements Not Yet Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2019-12

Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes

The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued, with the amendments to be applied on a respective, modified retrospective or prospective basis, depending on the specific amendment.

The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements.

Planned date of adoption: Q1 2021

The Company considers the applicability and impact of all ASUs. ASUs not listed above were assessed and determined to be either not applicable, or had or are expected to have minimal impact on our financial statements and related disclosures.

Revenue (Notes)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue

REVENUESales includes revenue from contracts with customers for designing, engineering, manufacturing and installation of solar racking systems and greenhouse structures; extraction systems; roof and foundation ventilation products; centralized mail systems and electronic package solutions; rain dispersion products and roofing accessories; expansion joints and structural bearings.

Refer to Note 20 "Segment Information" for additional information related to revenue recognized by timing of transfer of control by reportable segment.

Payment terms and conditions vary by contract, although terms generally include a requirement of payment within a range from 30 to 60 days, or in certain cases, up front deposits. In circumstances where the timing of revenue recognition differs from the timing of invoicing, the Company has determined that the Company's contracts generally do not include a significant financing component. Taxes collected from customers, which are subsequently remitted to governmental authorities, are excluded from sales.

As of December 31, 2020, the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less. Additionally, as of December 31, 2020 and 2019, there were no assets recognized related to incremental costs of obtaining a contract with a customer as the benefits of these costs are not expected to exceed one year.

Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue, respectively. The following table presents the ending and beginning balances of costs in excess of billings, billings in excess of cost and unearned revenue, respectively, as of December 31, (in thousands):


	2020		2019		2018
Costs in excess of billings	$	26,915	$	20,607	$	22,634
Billings in excess of cost	(34,702)		(47,598)		(17,857)
Unearned revenue	(21,325)		(15,389)		(10,847)

Revenue recognized that was included in billings in excess of cost and unearned revenue at the beginning of the periods, respectively, during the years ended December 31, (in thousands):


	2020		2019		2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	45,536	$	17,371	$	10,097
Amounts included in unearned revenue at the beginning of the period	$	12,229	$	10,090	$	2,988

At December 31, 2020, costs in excess of billings, billings in excess of cost, and unearned revenue included approximately $6.8 million, $12.4 million and $9.0 million, respectively, from acquisitions during the year ended December 31, 2020. The increase in contract liabilities as of December 31, 2019 compared to December 31, 2018 was primarily due to the timing of significant advanced and up-fronts payments in the Renewable Energy and Conservation segment near the end of December 31, 2019 from contracts with customers for which the performance obligations had not been satisfied.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Accounts Receivable

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Accounts Receivable

ACCOUNTS RECEIVABLE, NET

Accounts receivable at December 31 consisted of the following (in thousands):


	2020		2019
Trade accounts receivable	$	174,604	$	119,239
Costs in excess of billings	26,915		20,607
Total accounts receivables	201,519		139,846
Less allowance for doubtful accounts	(3,529)		(5,951)
Accounts receivable, net	$	197,990	$	133,895

Refer to Note 3 "Revenue" concerning the Company's costs in excess of billings. The Company's accounts receivable balance as of December 31, 2020 primarily increased from December 31, 2019 due to acquired receivables of approximately $62 million during 2020. Refer to Note 6 "Acquisitions" for additional information concerning the Company's acquisitions.

The Company considered the current and expected future economic and market conditions surrounding the COVID-19 pandemic and determined that the estimate of credit losses was not significantly impacted as of December 31, 2020.

Inventories

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories at December 31 consisted of the following (in thousands):


	2020		2019
Raw material	$	66,018	$	42,030
Work-in-process	5,382		5,023
Finished goods	31,205		18,460
Gross inventory	$	102,605	$	65,513
Less reserves	(4,298)		(3,556)
Total inventories	$	98,307	$	61,957

The Company's gross inventory balances are reduced by reserves for excess, obsolete and slow moving inventory and estimates for determining net realizable value of the inventory that are reported on a net basis on the Company's consolidated balance sheet.

The Company's total inventory balance as of December 31, 2020 increased from December 31, 2019 largely due to acquired inventory of approximately $30 million during 2020. Refer to Note 6 "Acquisitions" for additional information concerning the Company's acquisitions.

The following table summarizes activity recorded within the reserve for excess, obsolete and slow moving inventory for the years ended December 31 (in thousands):


	2020		2019		2018
Beginning balance	$	3,463	$	2,971	$	2,852
Excess, obsolete and slow moving inventory expense	355		1,134		363
Scrapped inventory and other adjustments	343		(642)		(244)
Ending balance	$	4,161	$	3,463	$	2,971

Property, Plant, and Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment

PROPERTY, PLANT, AND EQUIPMENT

Components of property, plant, and equipment at December 31 consisted of the following (in thousands):


	2020		2019
Land and land improvements	$	4,605	$	4,583
Building and improvements	41,164		39,901
Machinery and equipment	188,853		174,058
Construction in progress	10,458		5,131
Property, plant, and equipment, gross	245,080		223,673
Less: accumulated depreciation	(155,518)		(145,521)
Property, plant, and equipment, net	$	89,562	$	78,152

Acquisitions

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Acquisitions

ACQUISITIONS

2020 Acquisitions

During the year ended December 31, 2020, the Company acquired five businesses in separate transactions, four of which are included within our Renewable Energy and Conversation and one in our Residential Products segments. The total preliminary purchase consideration was $313.3 million, and the preliminary allocation of purchase consideration for each acquisition was allocated to the assets acquired and liabilities assumed based upon their respective fair values.

On December 31, 2020, the Company purchased all the outstanding stock of TerraSmart LLC ("TerraSmart"), the leading provider of screw-based, ground-mount solar racking technology, particularly used for solar projects installed on challenging terrain. The results of TerraSmart have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The preliminary purchase consideration for the acquisition of TerraSmart was $228.2 million, which includes a preliminary working capital adjustment and certain other adjustments provided for in the stock purchase agreement.

The purchase price for the acquisition was preliminarily allocated to the assets acquired and liabilities assumed based upon their respective fair values estimated as of the date of acquisition. The Company has commenced the process to confirm existence, condition and completeness of assets acquired and liabilities assumed to obtain fair values of the assets acquired and liabilities assumed to determine the amount of goodwill to be recognized as of the date of acquisition. Due to the timing of the acquisition, we continue to gather information supporting the acquired assets and liabilities. Accordingly, all amounts recorded were provisional. These provisional amounts are subject to change if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date The final determination of the fair value of certain assets and liabilities will be completed within the measurement period of up to one year from the date of acquisition. The final values may also result in changes to depreciation and amortization expense

related to certain assets such as property, plant and equipment and acquired intangible assets. The excess consideration was recorded as goodwill and approximated $143.2 million, all of which is deductible for tax purposes. Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and increased presence in the domestic solar energy market. The final purchase price allocation will be completed no later than December 31, 2021.

The preliminary allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	1,712
Working capital	23,833
Property, plant and equipment	8,345
Acquired intangible assets	51,700
Other assets	1,478
Other liabilities	(2,081)
Goodwill	143,245
Fair value of purchase consideration	$	228,232

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	16,400	Indefinite
Trademarks	300		7 years
Technology	2,500		15 years
Customer relationships	24,000		10 years
Non-compete agreements	2,200		5 years
Backlog	6,300		Less than 1 year
Total	$	51,700

On December 11, 2020, the Company purchased all the outstanding stock of Sunfig Corporation ("Sunfig"), a provider of software solutions that optimize solar energy investments through upstream design, performance and financial modeling, for a preliminary purchase consideration of $3.8 million, which includes a preliminary working capital adjustment and certain other adjustments provided for in the stock purchase agreement. The results of Sunfig have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The excess consideration was recorded as goodwill and approximated $3.2 million, all of which is deductible for tax purposes.

On October 15, 2020, the Company purchased substantially all of the assets of Architectural Mailboxes LLC ("Architectural Mailboxes"), a complementary addition to Gibraltar's existing mail and package solutions business within the Residential Products segment, for a preliminary purchase consideration of $26.9 million, which includes a working capital adjustment and certain other adjustments provided for in the asset purchase agreement. The results of Architectural Mailboxes have been included in the Company's consolidated financial results since the date of acquisition within the Company's Residential Products segment. The excess consideration was recorded as goodwill and approximated $7.4 million, all of which is deductible for tax purposes.

On February 13, 2020, the Company purchased substantially all of the assets of Delta Separations, LLC, a California limited liability company, and Teaching Tech, LLC, a California limited liability company (collectively, "Delta Separations") for a preliminary purchase consideration of $47.1 million, which includes a working capital adjustment and certain other adjustments provided for in the asset purchase agreement. Delta Separations was a privately-held engineering company primarily engaged in the assembly and sale of centrifugal ethanol-based extraction systems. The results of Delta Separations have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The excess consideration was recorded as goodwill and approximated $32.2 million, all of which is deductible for tax purposes.

On January 15, 2020, the Company purchased substantially all of the assets of Thermo Energy Systems Inc. ("Thermo"), a Canadian-based, privately held provider of commercial greenhouse solutions in North America providing growing infrastructure for the plant based organic food market, for a preliminary purchase consideration of $7.3 million. The results of Thermo have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. Goodwill of approximately $18.7 million was recorded, all of which is deductible for tax purposes.

The preliminary allocation of the purchase price of the four 2020 acquisitions noted above - Sunfig, Architectural Mailboxes, Delta Separations, and Thermo - is subject to adjustments during the measurement period as third-party valuations are finalized. The preliminary allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed in these four acquisitions is as follows as of the respective date of the acquisition (in thousands):


Cash	$	145
Working capital	(14,930)
Property, plant and equipment	1,740
Acquired intangible assets	38,296
Other current assets	1,528
Other assets	2,381
Other liabilities	(5,508)
Goodwill	61,436
Fair value of purchase consideration	$	85,088

Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and increased presence in the respective markets.

The intangible assets acquired in the four acquisitions noted above consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	8,200	Indefinite
Trademarks	1,177		3 years
Technology	8,175		7 - 15 years
Customer relationships	18,780		5 - 13 years
Non-compete agreements	1,036		5 years
Backlog	928		Less than 1 year
Total	$	38,296

2019 Acquisition

On August 30, 2019, the Company acquired all of the outstanding membership interests of Apeks LLC ("Apeks"), a designer and manufacturer of botanical oil extraction systems and equipment. The results of Apeks have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The aggregate purchase consideration for the acquisition of Apeks was $12.6 million, which includes a working capital adjustment and certain other adjustments provided for in the membership interest purchase agreement.

The purchase price for the acquisition was allocated to the assets acquired and liabilities assumed based upon their respective fair values. The excess consideration was recorded as goodwill and approximated $6.4 million, all of which is deductible for tax purposes. Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and presence in the extraction processing markets.

The allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	4,154
Working capital	(1,515)
Property, plant and equipment	1,059
Acquired intangible assets	3,000
Other assets	508
Other liabilities	(1,081)
Goodwill	6,436
Fair value of purchase consideration	$	12,561

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	1,400	Indefinite
Technology	900		7 years
Customer relationships	700		6 years
Total	$	3,000

2018 Acquisition

On August 21, 2018, the Company acquired all of the outstanding stock of SolarBOS. SolarBOS is a provider of electrical balance of systems products, which consists of electrical components such as wiring, switches, and combiner boxes that support photovoltaic systems, for the U.S. renewable energy market. The Company expects the acquisition of SolarBOS to enable the Company to provide complementary product offerings to its existing customers and strengthen its position in the renewable energy market. The results of SolarBOS have been included in the Company's consolidated financial results since the date of acquisition (within the Company's Renewable Energy and Conservation segment). The aggregate purchase consideration for the acquisition of SolarBOS was $6.4 million, which includes a working capital adjustment and certain other adjustments provided for in the stock purchase agreement.

The purchase price for the acquisition was allocated to the assets acquired and liabilities assumed based upon their respective fair values. The excess consideration was recorded as goodwill and approximated $2.9 million, all of which is deductible for tax purposes. Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and increased presence in the renewable energy markets.

The allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	915
Working capital	680
Property, plant and equipment	483
Acquired intangible assets	1,450
Other assets	13
Other liabilities	(51)
Goodwill	2,879
Fair value of purchase consideration	$	6,369

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

The acquisition of TerraSmart was financed through a combination of cash on hand and borrowings under the Company's revolving credit facility. The acquisitions of Sunfig, Architectural Mailboxes, Delta Separations, Thermo, Apeks and SolarBOS were funded from cash on hand.

The Company incurred certain acquisition-related costs composed of legal and consulting fees, and these costs were recognized as a component of selling, general, and administrative expenses in the consolidated statements of operations. The Company also recognized costs related to the sale of inventory at fair value as a result of allocating the purchase price of recent acquisitions.

All acquisition related costs consisted of the following for the years ended December 31 (in thousands):


	2020		2019		2018
Cost of sales	$	634	$	401	$	—
Selling, general and administrative costs	3,230		1,517		497
Total acquisition related costs	$	3,864	$	1,918	$	497

Goodwill and Related Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Related Intangible Assets

GOODWILL AND RELATED INTANGIBLE ASSETS

Goodwill

The changes in the carrying amount of goodwill for the years ended December 31 were as follows (in thousands):


	Renewable Energy & Conservation		Residential Products		Infrastructure Products		Total
Balance at December 31, 2018	$	71,827	$	198,075	$	31,678	$	301,580
Acquired goodwill	5,857		—		—		5,857
Adjustments to prior year acquisitions	(172)		—		—		(172)

Foreign currency translation	90		—		—		90
Balance at December 31, 2019	$	77,602	$	198,075	31,678		$	307,355
Acquired goodwill	197,866		7,377		—		205,243

Adjustments to prior year acquisitions	578		—		—		578
Foreign currency translation	1,103		—		—		1,103
Balance at December 31, 2020	$	277,149	$	205,452	31,678		$	514,279

Goodwill is recognized net of accumulated impairment losses of $133.2 million as of December 31, 2020 and 2019, respectively. No goodwill impairment charges were recognized by the Company during 2020 or 2019.

Annual Impairment Testing

The Company performed its annual goodwill impairment test as of October 31, 2020, 2019, and 2018.

During the October 31, 2020 impairment test, the Company conducted a quantitative analysis for all ten of the Company’s reporting units. The quantitative impairment test consists of comparing the fair value of a reporting unit with its carrying value including goodwill. The fair value of each reporting unit evaluated under the quantitative test was determined using two valuation techniques: an income approach and a market approach. Each valuation approach relies on significant assumptions including a weighted average cost of capital ("WACC") based upon the capital structure of market participants in the Company’s peer groups, projected revenue growth, forecasted cash flows, and earnings multiples based on the market value of the Company and market participants within its peer groups.

As a result of our annual testing for 2020, 2019 and 2018, none of the reporting units with goodwill as of our testing date had carrying values in excess of their fair values.

Interim Impairment Testing

The Company tests goodwill and indefinite-lived intangible assets for impairment on an annual basis as of October 31 and at interim dates when indicators of impairment are present. The Company considered the current and future macroeconomic and market conditions, along with its current market capitalization, projected cash flows and internal and external forecasts, and projections relating to the impact of the COVID-19 pandemic on each of its reporting units during the interim periods. The Company determined that no triggering events had occurred which would require an interim impairment test to be performed. In 2020, 2019 and 2018, no indicators of impairment were identified as of interim dates; therefore, no interim tests were performed.

Acquired Intangible Assets

Acquired intangible assets consist of the following (in thousands):


	December 31, 2020				December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Indefinite-lived intangible assets:
Trademarks	$	56,570	$	—	$	32,570	$	—
Finite-lived intangible assets:
Trademarks	5,818		3,385		4,340		2,680
Unpatented technology	38,752		17,765		28,177		15,196
Customer relationships	98,500		31,580		55,401		26,028
Non-compete agreements	4,885		1,747		1,649		1,499
Backlog	7,228		911		—		—
	155,183		55,388		89,567		45,403
Total acquired intangible assets	$	211,753	$	55,388	$	122,137	$	45,403

The Company did not recognize impairment charges related to indefinite-lived trademark intangible assets for the years ended December 31, 2020 and 2019. During the year ended December 31, 2018, the Company recognized impairment charges of $1.2 million related to indefinite-lived trademark intangible assets. The Company also recognized impairment charges of $0.3 million related to finite-lived intangible assets for the year ended December 31, 2018.

The Company recognized amortization expense related to the definite-lived intangible assets. The following table summarizes amortization expense for the years ended December 31 (in thousands):


	2020		2019		2018
Amortization expense	$	9,663	$	6,891	$	7,190

Amortization expense related to acquired intangible assets for the next five years ended December 31 is estimated as follows (in thousands):


	2021		2022		2023		2024		2025
Amortization expense	$	18,362	$	11,584	$	10,721	$	10,611	$	10,382

Accrued Expenses

12 Months Ended

Dec. 31, 2020

Accrued Liabilities, Current [Abstract]

Accrued Expenses

ACCRUED EXPENSES

Accrued expenses at December 31 consist of the following (in thousands):


	2020		2019
Compensation	$	18,131	$	13,509
Current portion of cash-settled share-based liabilities	3,504		14,817
Interest and taxes	1,850		3,569
Customer rebates	11,575		10,266
Insurance	6,915		8,353
Current operating lease liability	8,034		6,487

Unearned revenue	21,325		15,389

Other	12,171		14,207
Total accrued expenses	$	83,505	$	86,597

Accrued expenses for insurance are primarily for general liability, workers’ compensation and employee healthcare policies for which the Company is self-insured up to certain per-occurrence and aggregate limits. The amounts accrued represent the Company's best estimates of the probable amount of claims to be paid. Differences between the amounts accrued and the amount that may be reasonably possible of payment are not material. Accrued expenses for unearned revenue primarily relate to up-front customer deposits received on contracts for goods and services to be provided by the Company as further discussed in Note 3 "Revenue". The current portion of share-based liabilities represents the Company's equity-based awards that are settled in cash, further described in Note 12 "Equity-Based Compensation".

Debt

12 Months Ended

Dec. 31, 2020

Long-term Debt, Unclassified [Abstract]

Debt

DEBT

The Company's long-term debt outstanding at December 31, 2020 was $85.6 million, consisting of $85.0 million of borrowings under the revolving credit facility and $0.6 million of other debt. As of December 31, 2019, the Company had no outstanding debt.

Senior Credit Agreement

On January 24, 2019, the Company entered into the Sixth Amended and Restated Credit Agreement ("Senior Credit Agreement"), which amended and restated the Company’s Fifth Amended and Restated Credit Agreement dated December 9, 2015, and provided a revolving credit facility and letters of credit in an aggregate amount equal to $400 million. The Company can request additional financing to increase the revolving credit facility to $700 million or enter into a term loan of up to $300 million subject to conditions set forth in the Senior Credit Agreement. The Senior Credit Agreement contains three financial covenants. As of December 31, 2020, the Company was in compliance with all three covenants.

Interest rates on the revolving credit facility are based on LIBOR plus an additional margin that ranges from 1.125% to 2.00%. In addition, the revolving credit facility is subject to an undrawn commitment fee ranging between 0.15% and 0.25% based on the Total Leverage Ratio and the daily average undrawn balance. The Senior Credit Agreement terminates on January 23, 2024.

Borrowings under the Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and general intangibles of the Company’s significant domestic subsidiaries.

Standby letters of credit of $5.8 million have been issued under the Senior Credit Agreement to third parties on behalf of the Company as of December 31, 2020. These letters of credit reduce the amount otherwise available under the revolving credit facility. The Company had $309.2 million and $394.0 million of availability under the revolving credit facility as of December 31, 2020 and 2019, respectively.

Total cash paid for interest in the years ended December 31 was (in thousands):


	2020		2019		2018
Interest expense, net	$	703	$	2,323	$	10,709
Interest income	276		764		2,156
Other non-cash adjustments	(345)		(380)		(529)
Cash paid for interest	$	634	$	2,707	$	12,336

Pension and Other Postretirement Benefits

12 Months Ended

Dec. 31, 2020

Other Postretirement Benefits [Abstract]

Pension and Other Postretirement Benefits

PENSION AND OTHER POSTRETIREMENT BENEFITS

The Company has a 401(k) plan which all employees of U.S. subsidiaries are eligible to participate.

The Company contributes to a multiemployer defined benefit pension plan under the terms of a collective-bargaining agreement that covers union-represented employees.

The Company has an unfunded postretirement healthcare plan which provides health insurance to certain employees and their spouses upon retirement. This plan has been frozen and no additional participants will be added to the plan in the future.

Total expense for all retirement plans for the years ended December 31 was (in thousands):


	2020		2019		2018
401(k) plan	$	2,403	$	2,031	$	1,876
Multiemployer and other defined benefit and pension plans	70		195		239
Postretirement healthcare plan	351		346		427
Total retirement plan expense	$	2,824	$	2,572	$	2,542

The Company's one multiemployer plan is underfunded and has a rehabilitation plan in place. The rehabilitation plan requires minimum contributions from the Company. Given the status of this plan, it is reasonably possible that future contributions to the plan will increase although the Company cannot reasonably estimate a possible range of increased contributions as of December 31, 2020.

The following table presents the changes in the accumulated postretirement benefit obligation related to the Company’s unfunded postretirement healthcare benefits at December 31 (in thousands):


	2020		2019
Projected benefit obligation at January 1	$	6,024	$	6,135
Service cost	10		17
Interest cost	172		234

Actuarial gain	580		(52)
Benefits paid, net of contributions	(343)		(310)
Projected benefit obligation at December 31	6,443		6,024
Fair value of plan assets	—		—
Under funded status	(6,443)		(6,024)
Unamortized prior service cost	294		338
Unrecognized actuarial loss	1,843		1,328
Net amount recognized	$	(4,306)	$	(4,358)

Amounts recognized in the consolidated financial statements consisted of (in thousands):


	2020		2019
Accrued postretirement benefit liability
Current portion	$	335	$	330
Long term portion	6,108		5,694
Pre-tax accumulated other comprehensive loss – unamortized post-retirement healthcare costs	(2,137)		(1,666)
Net amount recognized	$	4,306	$	4,358

The measurement date used to determine postretirement benefit obligation measures was December 31.

Components of net periodic postretirement benefit cost charged to expense for the years ended December 31 were as follows (in thousands):


	2020			2019			2018
Service cost	$	10		$	17		$	18
Interest cost	172			234			233
Amortization of unrecognized prior service cost	44			44			44
Loss amortization (2)	64			51			132
Net periodic benefit cost	$	290		$	346		$	427
Assumptions used to calculate the benefit obligation:
Discount rate	2.0		%	2.9		%	4.1		%
Annual rate of increase in the per capita cost of:
Medical costs before age 65 (1)	7.0		%	6.8		%	7.0		%
Medical costs after age 65 (1)	4.5		%	4.5		%	5.0		%
Prescription drug costs (1)	7.0		%	7.0		%	9.5		%

(1) It was assumed that these rates would gradually decline to 3.8% by 2075.

(2) Actuarial (gains)/losses are amortized utilizing the corridor approach. Differences between actual

experience and the actuarial assumptions are reflected in (gain)/loss. If the total net (gain) or loss exceeds 10 percent of the greater of the accumulated postretirement benefit obligation or plan assets, this excess must be amortized over the average remaining service period of the active plan participants. If most of the plan participants are inactive, the amortization period is the expected future lifetime of inactive plan participants.

Expected benefit payments from the plan for the years ended December 31 are as follows (in thousands):


	2021		2022		2023		2024		2025		Years 2026 - 2030
Expected benefit payments	$	335	$	349	$	358	$	366	$	376	$	1,910

Accumulated Other Comprehensive (Loss) Income

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive (Loss) Income

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

The cumulative balance of each component of accumulated other comprehensive (loss) income is as follows (in thousands):


	Foreign Currency Translation Adjustment		Minimum post retirement benefit plan adjustments		Total Pre-Tax Amount		Tax (Benefit) Expense		Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939)	$	(2,040)	$	(7,979)	$	(745)	$	(7,234)
Minimum post retirement benefit plan adjustments	—		101		101		24		77

Foreign currency translation adjustment	1,766		—		1,766		—		1,766
Balance at December 31, 2019	$	(4,173)	$	(1,939)	$	(6,112)	$	(721)	$	(5,391)

Minimum post retirement benefit plan adjustments	—		(487)		(487)		(116)		(371)
Foreign currency translation adjustment	3,301		—		3,301		—		3,301
Balance at December 31, 2020	$	(872)	$	(2,426)	$	(3,298)	$	(837)	$	(2,461)

The realized adjustments relating to the Company’s minimum post retirement health care costs were reclassified from accumulated other comprehensive loss and included in other expense in the consolidated statements of operations.

Equity-Based Compensation

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Equity-Based Compensation

EQUITY-BASED COMPENSATION

The Company awards equity-based compensation to employees and directors, which is recognized in the statements of operations based on the grant-date fair value of the award. The Company uses the straight-line method for recording compensation expense over a vesting period generally up to four years with either graded or cliff vesting. Stock compensation expense recognized during the period is based on the value of the portion of equity-based awards that is ultimately expected to vest during the period reduced by the expense on unvested awards forfeited during the period.

On May 4, 2018, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Plan"). The 2018 Plan provides for the issuance of up to 1,000,000 shares of common stock and supplements the remaining shares available for issuance under the existing Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "2015 Plan"). The Company's 2005 Equity Incentive Plan (the "Prior Plan") was amended in 2015 to terminate issuance of further awards from the Prior Plan.

Both the 2018 Plan and the 2015 Plan allow the Company to grant equity-based incentive compensation awards, in the form of non-qualified options, restricted shares, restricted stock units, performance shares, performance stock units, and stock rights to eligible participants.

In 2016, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2016 Stock Plan for Non-Employee Directors ("Non-Employee Directors Plan") which allows the Company to grant awards of shares of the Company's common stock to non-employee Directors of the Company and permits the Directors to defer receipt of such shares pursuant to the terms of the Non-Employee Directors Plan.

At December 31, 2020, 513,000 and 136,000 shares were available for issuance under the 2018 Plan and 2015 Plan, respectively, as incentive stock options or other stock awards, and 29,000 shares were available for issuance under the Non-Employee Directors Plan as awards of shares of the Company's common stock.

The Company recognized the following compensation expense in connection with awards that vested under the 2018 Plan, the 2015 Plan, the Prior Plan, and the Non-Employee Directors Plan along with the related tax benefits recognized during the years ended December 31 (in thousands):


	2020		2019		2018
Expense recognized under the Prior Plan	$	40	$	192	$	569
Expense recognized under the 2015 Plan	1,932		5,077		7,988
Expense recognized under the 2018 Plan	5,441		6,731		188
Expense recognized under the Non-Employee Directors Plan	760		570		444
Total stock compensation expense	$	8,173	$	12,570	$	9,189
Tax benefits recognized related to stock compensation expense	$	2,272	$	3,136	$	2,509

Equity Based Awards - Settled in Stock

The following table provides the number of stock options, stock units, and common stock granted during the years ended December 31, along with the weighted-average grant-date fair value of each award:


	2020			2019			2018
Awards	Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value


Deferred stock units	12,402	$	45.98	7,509	$	37.95	10,255	$	35.96
Common stock	4,134	$	45.98	7,509	$	37.95	2,113	$	35.50
Restricted stock units	81,397	$	56.81	152,472	$	39.73	116,174	$	36.61
Performance stock units	160,426	$	55.98	183,908	$	40.49	135,929	$	33.63

Stock Options

No options were granted in 2020, 2019 and 2018. The Company determines the fair value of stock options granted based on the Black-Scholes option pricing model on the date of grant, and the expected stock volatility is based on volatility of the Company’s stock price using a historical period commensurate with the expected life of the options.

The following table summarizes the ranges of outstanding and exercisable options at December 31, 2020:


Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price		Options Exercisable	Weighted Average Exercise Price
$8.00 – $10.00	16,500	0.7	$	9.74	16,500	$	9.74
$10.01 – $39.00	—	0	$	—	—	$	—
$39.01 – $44.00	25,000	1.4	$	42.35	25,000	$	42.35


	41,500				41,500

The following table summarizes information about stock option transactions:


	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Balance at January 1, 2018	247,666	$	17.01

Exercised	(87,907)	15.75

Balance at December 31, 2018	159,759	$	17.70


Exercised	(42,350)	11.57
Balance at December 31, 2019	117,409	$	19.91
Exercised	(75,909)	14.73
Balance at December 31, 2020	41,500	$	29.38	1.13	$	1,766,000

The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value, based on the $71.94 per share market price of the Company’s common stock as of December 31, 2020, which would have been received by the option holders had all option holders with an exercise price below the per share market price on December 31, 2020, exercised their options as of that date.

Stock Units and Common Stock

The following table summarizes information about non-vested restricted stock units, performance stock units (that will convert to shares upon vesting) and common stock:


	Restricted Stock Units	Weighted Average Grant Date Fair Value		Common Stock	Weighted Average Grant Date Fair Value		Performance Stock Units (1) (2)	Weighted Average Grant Date Fair Value		Deferred Stock Units (3)	Weighted Average Grant Date Fair Value
Balance at December 31, 2019	374,432	$	33.74	—	$	—	329,257	$	38.53	34,752	$	34.21
Granted	82,328	$	56.81	4,134	$	45.98	160,426	$	55.98	12,402	$	45.98
Adjustments	—	$	—	—	$	—	27,528	$	40.98	—	$	—
Vested	(213,448)	$	34.14	(4,134)	$	45.98	(81,366)	$	40.77	—	$	—
Forfeited	(5,870)	$	40.92	—	$	—	(28,556)	$	40.27	—	$	—
Balance at December 31, 2020	237,442	$	41.15	—	$	—	407,289	$	45.00	47,154	$	37.30

(1) The Company’s performance stock units (“PSUs”) represent shares granted for which the final number of shares earned depends on financial performance or market conditions. The number of shares to be issued may vary between 0% and 200% of the number of performance stock units granted depending on the relative achievement to targeted thresholds. The Company's PSUs with a financial performance condition are based on either the Company’s return on invested capital (“ROIC”) over a one-year period performance period or revenue, gross profit, and operating profit thresholds over a two-year or three-year performance period. The Company's PSUs with a market condition are based on the ranking of the Company’s total shareholder return (“TSR”) performance, on a percentile basis, over a three year performance period compared to the S&P Small Cap Industrial sector, over the same three year performance period.

(2) The Company's PSU adjustments during 2020 represent additional shares granted for achievement in excess of targeted thresholds at the end of the performance period. The Company's PSUs with a financial performance condition, based on the Company’s ROIC, granted in 2019 accounted for 23,628 units of the total adjustments at a final achievement ratio of 116%. The Company's PSUs with a market condition, based on the relative ranking of the Company’s TSR performance, granted in 2017 accounted for the remaining 3,900 units at final achievement ratio of 115.6%.

(3) Vested and issued upon termination from service as a member of the Company's Board of Directors.

The fair value of the common stock, restricted stock units, and deferred stock units, as well as the performance stock units with a financial performance condition granted during the three years ended December 31, 2020 was based on the Company stock price at grant date of the award. The fair value of the performance stock units with a market condition granted during the three years ended December 31, 2020 were determined using a Monte Carlo simulation as of the grant date of the award. The Company granted performance units with a market condition during 2020, however, no such awards were granted in 2019 and 2018.

The following table sets forth the aggregate intrinsic value of options exercised and aggregate fair value of restricted stock units and restricted shares that vested during the years ended December 31 (in thousands):


	2020		2019		2018
Aggregate intrinsic value of options exercised	$	3,812	$	1,371	$	2,128
Aggregate fair value of vested restricted stock units	$	11,851	$	10,017	$	5,307
Aggregate fair value of vested common and restricted shares	$	190	$	285	$	149
Aggregate fair value of vested deferred stock units	$	570	$	285	$	369

As of December 31, 2020, there was $14.1 million of total unrecognized compensation cost related to non-vested options, restricted shares, and restricted stock units. That cost is expected to be recognized over a weighted average period of 2.3 years.

Equity Based Awards - Settled in Cash

As of December 31, 2020, the Company's total share-based liabilities recorded on the consolidated balance sheet was $18.2 million, of which $3.5 million was included in current accrued expenses and $14.7 million was included in non-current liabilities. Total share-based liabilities as of December 31, 2019 were $28.0 million, of which $13.2 million was included in non-current liabilities. At December 31, 2020, the Company's equity based awards that are settled in cash are the awards under the management stock purchase plan.

Management Stock Purchase Plan

The Management Stock Purchase Plan ("MSPP") provides participants the ability to defer a portion of their compensation, convertible to unrestricted investments, restricted stock units, or a combination of both, or defer a portion of their Directors’ fees, convertible to restricted stock units. Employees eligible to defer a portion of their compensation also receive a company-matching award in restricted stock units equal to a percentage of their deferred compensation.

The deferrals and related company match are credited to an account that represents a share-based liability. The portion of the account deferred to unrestricted investments is measured at fair market value of the unrestricted investments, and the portion of the account deferred to restricted stock units and company-matching restricted stock units is measured at a 200-day average of the Company stock price. The account will be converted to and settled in cash payable to participants upon retirement or a termination of their service to the Company.

The following table provides the number of restricted stock units credited to active participant accounts, balance of vested and unvested restricted stock units within active participant accounts, payments made with respect to restricted stock units issued under the MSPP, and MSPP expense during years ended December 31:


	2020		2019		2018
Restricted stock units credited	57,046		61,369		66,843
Restricted stock units balance, vested and unvested	231,343		415,760		387,870
Share-based liabilities paid, in thousands	$	15,401	$	6,543	$	5,232
MSPP expense, in thousands	$	4,518	$	2,699	$	4,809

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, various techniques and assumptions can be used to estimate fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement as follows: •Level 1 - Quoted prices in active markets for identical assets or liabilities. •Level 2 - Observable inputs other than quoted prices in active markets for similar assets and liabilities. •Level 3 - Inputs that are unobservable inputs for the asset or liability. The Company had no financial assets or liabilities measured at fair value on a recurring basis and did not have any financial instruments for which carrying value differed from its fair value at December 31, 2020 and 2019. As of December 31, 2020, the Company had $85 million outstanding on its revolving credit facility under its Senior Credit Agreement. The Company determined the carrying value of the outstanding balance on its revolving credit facility approximates fair value due to the variable market interest rate terms of the credit facility. The Company had no balance outstanding on its revolving credit facility as of December 31, 2019. The Company’s other financial instruments primarily consist of cash and cash equivalents, accounts receivable, notes receivable, and accounts payable. The carrying values for these financial instruments approximate fair value. The Company did not have any other material assets or liabilities carried at fair value and measured on a recurring basis as of December 31, 2020 and 2019. Other non-recurring fair value measurements While the Company did not recognize any impairment changes related to certain intangible assets and property, plant, and equipment during the year ended December 31, 2019, the Company did recognize impairment of property, plant, and equipment during the year ended December 31, 2020 and impairment of certain intangible assets and property, plant, and equipment during the year ended December 31, 2018. The Company uses unobservable inputs, classified as Level 3 inputs, in determining the fair value of these assets. See Note 7 "Goodwill and Related Intangible Assets" and Note 15 "Exit Activity Costs and Asset Impairments" for more disclosure regarding the impairment of certain intangible assets and property, plant, and equipment, respectively. The Company also applied fair value principles for the goodwill impairment tests performed during 2020, 2019, and 2018. The Company used two valuation models to estimate the fair values of its reporting units, both of which primarily use Level 3 inputs. See Note 7 of the consolidated financial statements for the results of the Company’s goodwill impairment tests. Additionally, the Company's recent acquisition activity, as described in Note 6 "Acquisitions", used Level 3 inputs to estimate fair values allocated to the assets acquired and liabilities assumed.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Discontinued Operations

12 Months Ended

Dec. 31, 2020

Discontinued Operations and Disposal Groups [Abstract]

DISCONTINUED OPERATIONS

During the fourth quarter of 2020, the Company committed to a plan to dispose its Industrial business as a result of its portfolio management strategy to focus on participation in higher value and faster growing markets. The Industrial business, previously reported in the Company's Industrial and Infrastructure Products segment, has been classified as held for sale. Accordingly, the results of operations and financial position of the held for sale Industrial business have been presented as a discontinued operation in the Company's consolidated financial statements for all periods presented. The assets and liabilities of discontinued operations held for sale are presented as current respectively at December 31, 2020 as it is probable that the disposal by sale will occur and proceeds will be collected within one year.

The Company allocates interest to its discontinued operations in accordance with ASC Subtopic 205-20, “Presentation of Financial Statements – Discontinued Operations.” Interest was allocated based on the amount of net assets held by the discontinued operation in comparison to consolidated net assets.

The following carrying amounts of the major classes of assets and liabilities included in discontinued operations related to the Industrial business has been segregated from the Company's continuing operations and are reported

as assets and liabilities of discontinued operations held for sale. respectively, in the consolidated balance sheets at December 31, (in thousands):


	2020		2019
Assets
Accounts receivable, net	$	11,261	$	13,620
Inventories, net	13,041		16,519
Prepaid expenses and other current assets	21,310		789
Total current assets (1)	45,612		30,928
Property, plant, and equipment, net	16,999		17,257
Operating lease assets	6,470		6,461
Goodwill	22,475		22,350
Acquired intangibles	15,482		15,858
Loss recognized on classification as held for sale	(29,600)		—
Total noncurrent assets (1)	31,826		61,926
Total assets classified as held for sale	$	77,438	$	92,854

Liabilities
Accounts payable	$	10,708	$	10,508
Accrued expenses	9,274		11,866
Total current liabilities (1)	19,982		22,374
Deferred income taxes	24,657		4,930
Non-current operating lease liabilities	4,639		4,726
Other non-current liabilities	17		14
Total noncurrent liabilities (1)	29,313		9,670
Total liabilities classified as held for sale	$	49,295	$	32,044

(1) The assets and liabilities of the disposal group classified as held for sale are classified as current on the December 31, 2020 consolidated balance sheet because it is probable that the sale will occur and proceeds will be collected within one year.

Components of the (loss) income from discontinued operations before taxes, including the interest allocated to discontinued operations, for the years ended December 31 were as follows (in thousands):


	2020		2019		2018
Net sales	$	128,915	$	150,225	$	166,378
Operating expenses	115,822		143,335		151,924
Loss on classification as held for sale	29,600		—		—
Interest expense allocation	95		208		1,632
(Loss) income from discontinued operations before taxes	$	(16,602)	$	6,682	$	12,822

Exit Activity Costs and Asset Impairments

12 Months Ended

Dec. 31, 2020

Restructuring and Related Activities [Abstract]

Exit Activity Costs and Asset Impairments

EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS

The Company has incurred exit activity costs and asset impairment charges as a result of its 80/20 simplification and portfolio management initiatives. These initiatives have resulted in the identification of low-volume, low margin, internally-produced products which have been or will be outsourced or discontinued, the simplification of processes, in the sale and exiting of less profitable businesses or products lines, and the reduction in our manufacturing footprint.

Exit activity costs were incurred during 2020 related to moving and closing costs, severance and contract terminations incurred as a result of process simplification initiatives. In conjunction with these initiatives, in 2020, the Company closed two facilities and, separately, sold a facility closed in 2017. The Company closed and

consolidated one facility during 2019. In 2018, the Company sold and leased back a facility which resulted in a gain, and closed four other facilities. These closures resulted in asset impairment charges and exit activity costs.

The following table sets forth the asset impairment charges and exit activity costs incurred by segment during the years ended December 31 related to the restructuring activities described above (in thousands):


	2020						2019				2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs		Total		Inventory write-downs &/or asset impairment (recoveries) charges, net		Exit activity costs		Total		Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net		Total
Renewable Energy & Conservation	$	72	$	875	$	947	$	(9)	$	66	$	57	$	105	$	(33)	$	72
Residential Products	9		731		740		417		3,440		3,857		1,586		1,321		2,907
Infrastructure Products	—		226		226		—		—		—		227		1,075		1,302
Corporate	—		375		375		—		1,660		1,660		—		438		438
Total exit activity costs & asset impairments	$	81	$	2,207	$	2,288	$	408	$	5,166	$	5,574	$	1,918	$	2,801	$	4,719

The following table provides a summary of where the above exit activity costs and asset impairments are recorded in the consolidated statements of operations for the years ended December 31 (in thousands):


	2020		2019		2018
Cost of sales	$	1,059	$	767	$	1,320
Selling, general, and administrative expense	1,229		4,807		3,399
Total exit activity costs and asset impairments	$	2,288	$	5,574	$	4,719

The following table reconciles the beginning and ending liability for exit activity costs relating to the Company’s facility consolidation efforts (in thousands):


	2020		2019
Balance as of January 1	$	2,083	$	1,865
Exit activity costs recognized	2,207		5,166
Cash payments	(3,260)		(3,799)
Non-cash charges	—		(1,149)
Balance as of December 31	$	1,030	$	2,083

On June 30, 2020, the Company sold its self-guided apartment tour application business to a third party from its Residential Products segment. The $2.0 million net proceeds from the sale resulted in pre-tax net gain of $1.9 million and has been presented within other (income) expense in the consolidated statements of income. This divestiture does not meet the criteria to be reported as a discontinued operation nor will it have a major effect on the Company's operations.

Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXESThe Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to reverse.

The components of income (loss) before taxes from continuing operations consisted of the following for the years ended December 31 (in thousands):


	2020		2019		2018
Domestic	$	108,930	$	78,351	$	70,783
Foreign	(1,171)		(270)		(3,660)
Income before taxes from continuing operations	$	107,759	$	78,081	$	67,123

The provision for (benefit of) income taxes from continuing operations for the years ended December 31 consisted of the following (in thousands):


	2020		2019		2018
Current:
U.S. Federal	$	16,505	$	10,394	$	8,316
State	4,071		3,547		2,942
Foreign	106		92		(2,972)
Total current	20,682		14,033		8,286
Deferred:
U.S. Federal	3,620		3,740		4,253
State	672		486		853
Foreign	(506)		(106)		(381)
Total deferred	3,786		4,120		4,725
Provision for income taxes	$	24,468	$	18,153	$	13,011

The provision for (benefit of) income taxes from discontinued operations for the years ended December 31 consisted of the following (in thousands):


	2020		2019		2018
Current:
U.S. Federal	$	1,345	$	885	$	1,086
State	57		4		202
Foreign	1,725		1,447		1,781
Total current	3,127		2,336		3,069
Deferred:
U.S. Federal	(876)		(823)		(95)
State	10		23		194
Foreign	(138)		(17)		(43)
Total deferred	(1,004)		(817)		56
Provision for income taxes	$	2,123	$	1,519	$	3,125

The provision for income taxes from continuing operations differs from the federal statutory rate of 21% due to the following (in thousands) for the years ended December 31:


	2020				2019				2018
Statutory rate	22,629		21.0	%	16,397		21.0	%	14,096		21.0	%
State taxes, less federal effect	3,650		3.4	%	3,194		4.1	%	2,901		4.3	%
Federal tax credits	(1,064)		(1.0)	%	(1,621)		(2.1)	%	(742)		(1.1)	%
Excess tax benefit on stock based compensation	(1,674)		(1.6)	%	(871)		(1.1)	%	(2,224)		(3.3)	%
Uncertain tax positions	—		—	%	(260)		(0.3)	%	(3,051)		(4.5)	%
Executive compensation	1,114		1.0	%	1,132		1.4	%	1,369		2.0	%
Change in valuation allowance	(130)		(0.1)	%	88		0.1	%	(1,694)		(2.5)	%
Net operating loss (NOL) write down	—		—	%	—		—	%	1,640		2.4	%
Change in Indemnification Asset	—		—	%	—		—	%	643		1.0	%









Other	(57)		—	%	94		0.1	%	73		0.1	%

	$	24,468	22.7	%	$	18,153	23.2	%	$	13,011	19.4	%

Deferred tax liabilities (assets) at December 31 consist of the following (in thousands):


	2020		2019
Depreciation	$	7,697	$	7,556
Goodwill	41,842		38,610
Intangible assets	5,632		6,171

Other	6,878		6,158
Gross deferred tax liabilities	62,049		58,495
Equity compensation	(7,496)		(9,530)
Other	(15,682)		(13,939)
Gross deferred tax assets	(23,178)		(23,469)
Valuation allowances	111		298
Deferred tax assets, net of valuation allowances	(23,067)		(23,171)
Net deferred tax liabilities	$	38,982	$	35,324

At December 31, 2020, the Company had total net operating loss carry forwards of $14.7 million, which included $0.5 million for federal, $10.2 million for state, and $4.0 million for foreign income tax purposes. The federal and state net operating loss carry forwards expire between 2021 and 2040. The foreign net operating loss carry forwards expire between 2022 and 2040. The Company recognized a total of $1.5 million of deferred tax assets, net of the federal tax benefit, related to these net operating losses prior to any valuation allowances, which included $0.1 million of federal and $0.3 million of state deferred tax assets and $1.1 million of foreign deferred tax assets.

Deferred taxes include net deferred tax assets relating to certain state and foreign tax jurisdictions. A reduction of the carrying amount of deferred tax assets by a valuation allowance is required if it is more likely than not that such assets will not be realized. The Company derecognized net operating loss carry forwards, and the corresponding valuation allowances of $1.7 million in Germany and Brazil since it exited both markets in 2018. In 2019, a valuation allowance was recorded in China. In 2020, the valuation allowance in China was reversed and a tax attribute valuation allowance was also reversed as the Company expects to utilize the attribute. The following sets forth a reconciliation of the beginning and ending amount of the Company’s valuation allowance (in thousands):


	2020		2019		2018
Balance as of January 1	$	298	$	206	$	2,002
Cost charged to the tax provision	70		100		45
Reductions	(248)		(10)		(1,747)

Currency translation	(9)		2		(94)
Balance as of December 31	$	111	$	298	$	206

Interest (net of federal tax benefit) and penalties recognized during the years ended December 31 were (in thousands):


	2020	2019	2018
Interest and penalties recognized as income	—	—	13

The Company made net payments for income taxes for the following amounts for the years ended December 31 (in thousands):


	2020		2019		2018
Payments made for income taxes, net	$	21,351	$	16,744	$	14,128

At December 31, 2020, the Company had approximately $0.2 million of undistributed earnings of foreign subsidiaries. The Company continues to maintain its assertion that all remaining foreign earnings will be indefinitely reinvested. Any excess earnings could be used to grow the Company's foreign operations through launches of new capital projects or additional acquisitions. Determination of the amount of unrecognized deferred U.S. income tax liability related to our remaining unremitted foreign earnings is not practicable due to the complexities associated with its hypothetical calculation.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):


	2020		2019		2018
Balance as of January 1	$	—	$	329	$	3,536
Additions for tax positions of the current year	—		—		15
Additions for tax positions of prior years	—		—		—
Reductions for tax positions of prior years for:
Settlements and changes in judgment	—		—		—
Lapses of applicable statute of limitations	—		(329)		(3,060)
Divestitures and foreign currency translation	—		—		(162)
Balance as of December 31	$	—	$	—	$	329

In 2020, the Company did not have any unrecognized tax benefits. In 2019, unrecognized tax benefit of $0.3 million was reversed as a result of the lapse of the statute of limitations. In 2018, the corresponding indemnification asset was also reversed in pretax income. The Company classifies accrued interest and penalties related to unrecognized tax benefits in income tax expense.

The Company and its U.S. subsidiaries file a U.S. federal consolidated income tax return. Foreign and U.S. state jurisdictions have statute of limitations generally ranging from four to ten years. The Company's U.S. federal consolidated income tax return is under examination for 2015 through 2018.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Earnings per Share

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings per Share

EARNINGS PER SHARE

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding, as well as dilutive common shares which include shares issuable under the equity compensation plans described in Note 12 of the consolidated financial statements. The weighted average number of diluted shares does not include potential anti-dilutive common shares aggregating 13,000, 30,000 and 303,000 at December 31, 2020, 2019 and 2018, respectively. The treasury stock method is used to calculate dilutive shares, which reduces the gross number of dilutive shares by the number of shares purchasable from the proceeds of the options assumed to be exercised and the unrecognized expense related to the options, restricted shares, restricted stock units, and performance stock units assumed to have vested.

Weighted average shares outstanding for basic and diluted earnings are as follows for the years ended December 31 (in thousands):


	2020		2019		2018
Numerator:
Income from continuing operations	$	83,291	$	59,928	$	54,112
(Loss) income from discontinued operations	(18,725)		5,163		9,697
Net income available to common shareholders	$	64,566	$	65,091	$	63,809
Denominator for basic earnings per share:
Weighted average shares outstanding	32,664		32,389		31,979
Denominator for diluted earnings per share:
Common stock options and stock units	254		333		555
Weighted average shares and conversions	32,918		32,722		32,534

Leases

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Leases

LEASES

The Company's leases are classified as operating leases and consist of manufacturing facilities, distribution centers, office space, vehicles and equipment.

Most of the Company's leases include one or more options to renew, with renewal terms that can extend the respective lease term from one month to fifteen years. The exercise of lease renewal options is at the Company's sole discretion. As of December 31, 2020, the Company's renewal options are not part of the Company's operating lease assets and operating lease liabilities. Certain leases also include options to purchase at fair value the underlying leased asset at the Company's sole discretion.

Amounts recognized in the Company's consolidated balance sheet at December 31 were as follows (in thousands):


		2020		2019
Assets	Operating lease assets	$	25,229	$	21,201

Liabilities
Current	Accrued expenses	$	8,034	$	6,487
Non-current	Non-current operating lease liabilities	17,730		14,943
		$	25,764	$	21,430

Lease costs and other lease information for the year ended December 31 were as follows (in thousands):


	2020		2019
Operating lease cost	$	11,001	$	10,441
Cash paid for amounts included in the measurement of operating liabilities	$	9,502	$	9,238
Right-of-use assets obtained in exchange for new lease liabilities	$	12,745	$	6,364


Lease Term and Discount Rate	December 31, 2020			December 31, 2019
Weighted-average remaining lease term - operating leases	3.6		years	3.8		years
Weighted-average discount rate - operating leases	5.2	%		5.7	%


Maturity of lease liabilities	(In thousands)
2021	$	9,139
2022	7,635
2023	6,483
2024	3,298
2025	1,043
After 2025	673
Total lease payments	28,271
Less: present value discount	(2,507)
Present value of lease liabilities	$	25,764

The Company uses the its incremental borrowing rate based on information available at the commencement date of a lease in determining the present value of lease payments as the rates implicit in most of the Company's leases are not readily determinable.

Upon adoption of ASU 2016-02 on January 1, 2019, an unrecognized deferred gain of $1.6 million related to sale-leaseback transactions was recorded as a cumulative-effect adjustment to increase retained earnings, net of related income tax effects.

Rent expense under operating leases aggregated to $9.7 million for the year ended December 31, 2018.

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIESThe Company is a party to certain claims and legal actions generally incidental to its business. For certain divestiture transactions completed in prior years, the Company has agreed to indemnify the buyer for various liabilities that may arise after the disposal date. The Company is a party to certain claims made under these indemnification provisions. As of December 31, 2020, the Company has a contingent liability recorded for such provisions related to discontinued operations. Management does not believe that the outcome of this claim, or other claims which are not clearly determinable at the present time, would significantly affect the Company's financial condition or results of operation.

Segment Information

12 Months Ended

Dec. 31, 2020

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Segment Information

SEGMENT INFORMATION

The Company is organized into three reportable segments on the basis of the production processes, products and services provided by each segment, identified as follows:

(i)Renewable Energy and Conservation, which primarily includes designing, engineering, manufacturing and installation of solar racking, electrical balance of systems, extraction systems and greenhouse structures;

(ii)Residential Products, which primarily includes roof and foundation ventilation products, rain dispersion products and roofing accessories, centralized mail systems and electronic package solutions; and

(iii)Infrastructure Products, which primarily includes expansion joints, structural bearings, rubber pre-formed seals and other sealants, elastomeric concrete, and bridge cable protection systems.

When determining the reportable segments, the Company aggregated operating segments based on their similar economic and operating characteristics.

The following table illustrates certain measurements used by management to assess the performance of the segments described above as of and for the years ended December 31 (in thousands):


	2020		2019		2018
Net sales:
Renewable Energy and Conservation	$	447,567	$	373,023	$	317,253
Residential Products	522,814		461,630		463,216
Infrastructure Products	62,197		63,580		56,628


Total consolidated net sales	$	1,032,578	$	898,233	$	837,097

Income from operations:
Renewable Energy and Conservation	$	40,738	$	47,558	$	37,423
Residential Products	94,430		63,047		69,838
Infrastructure Products	7,233		6,428		2,509
Segments income from operations	142,401		117,033		109,770
Unallocated corporate expenses	(35,211)		(36,221)		(28,629)
Total income from operations	$	107,190	$	80,812	$	81,141

Depreciation and Amortization
Renewable Energy and Conservation	$	9,445	$	6,132	$	5,790
Residential Products	8,110		7,906		8,217
Infrastructure Products	3,060		3,129		3,100
Unallocated corporate expenses	300		390		332
	$	20,915	$	17,557	$	17,439

Total assets
Renewable Energy and Conservation	$	619,071	$	246,853	$	218,048
Residential Products	407,132		359,657		361,499
Infrastructure Products	80,796		110,611		114,354
Unallocated corporate assets	28,057		174,475		271,616
Assets of discontinued operations	77,438		92,854		96,128
	$	1,212,494	$	984,450	$	1,061,645

Capital expenditures
Renewable Energy and Conservation	$	1,143	$	2,199	$	1,345
Residential Products	3,313		4,968		7,921
Infrastructure Products	1,511		1,028		927
Unallocated corporate expenditures	7,101		581		175
	$	13,068	$	8,776	$	10,368

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the years ended December 31 (in thousands):


	2020
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	75,727	$	518,281	$	22,781	$	616,789
Over Time	371,840		4,533		39,416		415,789
Total	$	447,567	$	522,814	$	62,197	$	1,032,578

	2019
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	42,596	$	458,006	$	26,490	$	527,092
Over Time	330,427		3,624		37,090		371,141
Total	$	373,023	$	461,630	$	63,580	$	898,233

	2018
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	33,427	$	460,513	$	22,806	$	516,746
Over Time	283,826		2,703		33,822		320,351
Total	$	317,253	$	463,216	$	56,628	$	837,097

Net sales by region or origin and long-lived assets by region of domicile for the years ended and as of December 31 are as follows (in thousands):


	2020		2019		2018
Net sales
North America	$	1,018,406	$	881,432	$	825,497

Asia	14,172		16,801		11,600
Total	$	1,032,578	$	898,233	$	837,097

Long-lived assets
North America	$	90,685	$	79,590	$	79,544

Asia	476		542		704
Total	$	91,161	$	80,132	$	80,248

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 32
-Subparagraph (f)
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Quarterly Unaudited Financial Data

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY UNAUDITED FINANCIAL DATA

GIBRALTAR INDUSTRIES, INC.

QUARTERLY UNAUDITED FINANCIAL DATA

(in thousands, except per share data)


	2020 Quarters Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	215,401	$	255,184	$	296,792	$	265,201	$	1,032,578
Gross profit	$	49,861	$	65,561	$	78,495	$	62,426	$	256,343
Income from continuing operations	$	12,777	$	30,748	$	40,943	$	22,722	$	107,190
Interest expense	$	44	$	222	$	217	$	220	$	703
Net income from continuing operations	$	9,902	$	24,457	$	31,334	$	17,598	$	83,291
Net income (loss) from discontinued operations	$	2,157	$	2,835	$	2,426	$	(26,143)	$	(18,725)
Total net income (loss)	$	12,059	$	27,292	$	33,760	$	(8,545)	$	64,566
Income per share from continuing operations:
Basic	$	0.30	$	0.75	$	0.96	$	0.54	$	2.55
Diluted	$	0.30	$	0.74	$	0.95	$	0.53	$	2.53
Income (loss) per share from discontinued operations:
Basic	$	0.07	$	0.09	$	0.07	$	(0.80)	$	(0.57)
Diluted	$	0.07	$	0.09	$	0.07	$	(0.79)	$	(0.57)


	2019 Quarters Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	187,160	$	224,255	$	260,784	$	226,034	$	898,233
Gross profit	$	37,259	$	56,468	$	68,744	$	57,426	$	219,897
Income from continuing operations	$	7,192	$	25,073	$	28,314	$	20,233	$	80,812
Interest expense (income)	$	2,000	$	249	$	79	$	(5)	$	2,323
Net income from continuing operations	$	4,131	$	18,803	$	21,951	$	15,043	$	59,928
Net income (loss) from discontinued operations	$	2,214	$	1,110	$	2,525	$	(686)	$	5,163
Total net income	$	6,345	$	19,913	$	24,476	$	14,357	$	65,091
Income per share from continuing operations:
Basic	$	0.13	$	0.58	$	0.68	$	0.46	$	1.85
Diluted	$	0.13	$	0.58	$	0.67	$	0.46	$	1.83
Income (loss) per share from discontinued operations:
Basic	$	0.07	$	0.04	$	0.07	$	(0.02)	$	0.16
Diluted	$	0.06	$	0.03	$	0.08	$	(0.02)	$	0.16

Subsequent Events (Notes)	12 Months Ended
Subsequent Events (Notes)	Dec. 31, 2020
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSOn February 23, 2021, the Company sold the stock of its Industrial business for net proceeds of approximately $38 million, consisting of $25 million in cash and a $13 million seller note, subject to working capital adjustments. The Industrial business was classified as held for sale and reported as discontinued operations in the Company's consolidated financial statements on this Form 10-K for the year ended December 31, 2020. The estimated loss on the sale of this business is $29.6 million.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Principles of consolidation

Use of estimates

Revenue recognition

Performance obligations satisfied at a point in time and significant judgments

Performance obligations satisfied over time and significant judgments

an expected cost plus a margin for each performance obligation. These promised products are generally capable of being distinct and accounted for as separate performance obligations.

Contract assets and contract liabilities

Costs to obtain a contract with a customer

Refer to Note 20 "Segment Information" for additional information related to revenue recognized by timing of transfer of control by reportable segment.


	2020		2019		2018
Costs in excess of billings	$	26,915	$	20,607	$	22,634
Billings in excess of cost	(34,702)		(47,598)		(17,857)
Unearned revenue	(21,325)		(15,389)		(10,847)

Cash and cash equivalents

All highly liquid investments with a maturity of three months or less are considered cash equivalents.

Accounts receivable and allowance for doubtful accounts and contract assets

Estimates are used to determine the allowance. These estimates are based on assessment of anticipated payment and all other historical, current and future information that is reasonably available.

The following table summarizes activity recorded within the allowance for doubtful accounts and contract assets balances for the years ended December 31 (in thousands):


	2020		2019		2018
Beginning balance	$	5,951	$	6,170	$	5,599
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings at January 1, 2020	385		—		—
Bad debt expense, net of recoveries	1,321		2,577		1,308
Accounts written off against allowance and other adjustments	(4,128)		(2,796)		(737)
Ending balance	$	3,529	$	5,951	$	6,170

Inventories

InventoriesInventories are valued at the lower of cost, determined using the first-in, first-out method, or net realizable value. Shipping and handling costs are recognized as a component of cost of sales.

Property, plant, and equipment

Property, plant, and equipmentProperty, plant, and equipment are stated at cost and depreciated over their estimated useful lives using the straight-line method. Interest is capitalized in connection with construction of qualified assets. Expenditures that exceed an established dollar threshold and that extend the useful lives of assets are capitalized, while repair and maintenance costs are expensed as incurred. The estimated useful lives of land improvements, buildings, and building improvements are 15 to 40 years, while the estimated useful lives for machinery and equipment are 3 to 20 years.

Goodwill and other intangible assets

Impairment of long-lived assets

Leases

Deferred charges

Deferred chargesDeferred charges associated with initial costs incurred to enter into new debt arrangements are included in other assets and are amortized as a part of interest expense over the terms of the associated debt agreements.

Advertising

AdvertisingThe Company expenses advertising costs as incurred.

Foreign currency transactions and translation

Foreign currency transactions and translationThe assets and liabilities of the Company’s foreign subsidiaries are translated into U.S. dollars at the rate of exchange in effect at the balance sheet date. Income and expense items are translated at the average exchange rates prevailing during the period.

Income taxes

Income taxesThe provision for income taxes is determined using the asset and liability approach. Under this approach, deferred income taxes represent the expected future tax consequences of temporary differences between the carrying amounts and tax basis of assets and liabilities. The Company records a valuation allowance to reduce deferred tax assets when uncertainty exists regarding their realization.

Equity-based compensation

Equity-based compensationThe Company measures the cost of equity-based compensation based on grant date fair value and recognizes the cost over the period in which the employee is required to provide service in exchange for the award reduced by forfeitures. Equity-based compensation consists of grants of stock options, deferred stock units, common stock, restricted stock units, and performance stock units. Equity-based compensation expense is included as a component of selling, general, and administrative expenses.

Recent accounting pronouncements

Recent Accounting Pronouncements Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2016-13

Financial Instruments - Credit Losses

(Topic 326)

Date of adoption: Q1 2020

ASU 2018-15

Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract

Date of adoption: Q1 2020

Recent Accounting Pronouncements Not Yet Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2019-12

Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes

The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements.

Planned date of adoption: Q1 2021

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Summary Of Activity Recorded Within The Allowance For Doubtful Accounts

The following table summarizes activity recorded within the allowance for doubtful accounts and contract assets balances for the years ended December 31 (in thousands):


	2020		2019		2018
Beginning balance	$	5,951	$	6,170	$	5,599
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings at January 1, 2020	385		—		—
Bad debt expense, net of recoveries	1,321		2,577		1,308
Accounts written off against allowance and other adjustments	(4,128)		(2,796)		(737)
Ending balance	$	3,529	$	5,951	$	6,170

Property, Plant and Equipment

The table below sets forth the depreciation expense recognized during the years ended December 31 (in thousands):


	2020		2019		2018
Depreciation expense	$	11,252	$	10,666	$	10,249

Components of property, plant, and equipment at December 31 consisted of the following (in thousands):


	2020		2019
Land and land improvements	$	4,605	$	4,583
Building and improvements	41,164		39,901
Machinery and equipment	188,853		174,058
Construction in progress	10,458		5,131
Property, plant, and equipment, gross	245,080		223,673
Less: accumulated depreciation	(155,518)		(145,521)
Property, plant, and equipment, net	$	89,562	$	78,152

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Recent Accounting Pronouncements Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2016-13

Financial Instruments - Credit Losses

(Topic 326)

Date of adoption: Q1 2020

ASU 2018-15

Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract

Date of adoption: Q1 2020

Recent Accounting Pronouncements Not Yet Adopted

Standard

Description

Financial Statement Effect or Other Significant Matters

ASU No. 2019-12

Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes

The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements.

Planned date of adoption: Q1 2021

Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table presents the ending and beginning balances of costs in excess of billings, billings in excess of cost and unearned revenue, respectively, as of December 31, (in thousands):


	2020		2019		2018
Costs in excess of billings	$	26,915	$	20,607	$	22,634
Billings in excess of cost	(34,702)		(47,598)		(17,857)
Unearned revenue	(21,325)		(15,389)		(10,847)

Revenue recognized that was included in billings in excess of cost and unearned revenue at the beginning of the periods, respectively, during the years ended December 31, (in thousands):


	2020		2019		2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	45,536	$	17,371	$	10,097
Amounts included in unearned revenue at the beginning of the period	$	12,229	$	10,090	$	2,988

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable at December 31 consisted of the following (in thousands):


	2020		2019
Trade accounts receivable	$	174,604	$	119,239
Costs in excess of billings	26,915		20,607
Total accounts receivables	201,519		139,846
Less allowance for doubtful accounts	(3,529)		(5,951)
Accounts receivable, net	$	197,990	$	133,895

Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories at December 31 consisted of the following (in thousands):


	2020		2019
Raw material	$	66,018	$	42,030
Work-in-process	5,382		5,023
Finished goods	31,205		18,460
Gross inventory	$	102,605	$	65,513
Less reserves	(4,298)		(3,556)
Total inventories	$	98,307	$	61,957

Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory

The following table summarizes activity recorded within the reserve for excess, obsolete and slow moving inventory for the years ended December 31 (in thousands):


	2020		2019		2018
Beginning balance	$	3,463	$	2,971	$	2,852
Excess, obsolete and slow moving inventory expense	355		1,134		363
Scrapped inventory and other adjustments	343		(642)		(244)
Ending balance	$	4,161	$	3,463	$	2,971

Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Components of Property, Plant, and Equipment

The table below sets forth the depreciation expense recognized during the years ended December 31 (in thousands):


	2020		2019		2018
Depreciation expense	$	11,252	$	10,666	$	10,249

Components of property, plant, and equipment at December 31 consisted of the following (in thousands):


	2020		2019
Land and land improvements	$	4,605	$	4,583
Building and improvements	41,164		39,901
Machinery and equipment	188,853		174,058
Construction in progress	10,458		5,131
Property, plant, and equipment, gross	245,080		223,673
Less: accumulated depreciation	(155,518)		(145,521)
Property, plant, and equipment, net	$	89,562	$	78,152

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Schedule of Allocation of the Purchase Price Consideration of the Fair Value of Assets Acquired and Liabilities Assumed

The preliminary allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	1,712
Working capital	23,833
Property, plant and equipment	8,345
Acquired intangible assets	51,700
Other assets	1,478
Other liabilities	(2,081)
Goodwill	143,245
Fair value of purchase consideration	$	228,232


Cash	$	145
Working capital	(14,930)
Property, plant and equipment	1,740
Acquired intangible assets	38,296
Other current assets	1,528
Other assets	2,381
Other liabilities	(5,508)
Goodwill	61,436
Fair value of purchase consideration	$	85,088

The allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	4,154
Working capital	(1,515)
Property, plant and equipment	1,059
Acquired intangible assets	3,000
Other assets	508
Other liabilities	(1,081)
Goodwill	6,436
Fair value of purchase consideration	$	12,561

The allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):


Cash	$	915
Working capital	680
Property, plant and equipment	483
Acquired intangible assets	1,450
Other assets	13
Other liabilities	(51)
Goodwill	2,879
Fair value of purchase consideration	$	6,369

Schedule of Acquired Intangible Assets

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	16,400	Indefinite
Trademarks	300		7 years
Technology	2,500		15 years
Customer relationships	24,000		10 years
Non-compete agreements	2,200		5 years
Backlog	6,300		Less than 1 year
Total	$	51,700

The intangible assets acquired in the four acquisitions noted above consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	8,200	Indefinite
Trademarks	1,177		3 years
Technology	8,175		7 - 15 years
Customer relationships	18,780		5 - 13 years
Non-compete agreements	1,036		5 years
Backlog	928		Less than 1 year
Total	$	38,296

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	1,400	Indefinite
Technology	900		7 years
Customer relationships	700		6 years
Total	$	3,000

The intangible assets acquired in this acquisition consisted of the following (in thousands):


	Fair Value		Weighted-Average Amortization Period
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

Schedule of Business Combination Costs

All acquisition related costs consisted of the following for the years ended December 31 (in thousands):


	2020		2019		2018
Cost of sales	$	634	$	401	$	—
Selling, general and administrative costs	3,230		1,517		497
Total acquisition related costs	$	3,864	$	1,918	$	497

Goodwill and Related Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31 were as follows (in thousands):


	Renewable Energy & Conservation		Residential Products		Infrastructure Products		Total
Balance at December 31, 2018	$	71,827	$	198,075	$	31,678	$	301,580
Acquired goodwill	5,857		—		—		5,857
Adjustments to prior year acquisitions	(172)		—		—		(172)

Foreign currency translation	90		—		—		90
Balance at December 31, 2019	$	77,602	$	198,075	31,678		$	307,355
Acquired goodwill	197,866		7,377		—		205,243

Adjustments to prior year acquisitions	578		—		—		578
Foreign currency translation	1,103		—		—		1,103
Balance at December 31, 2020	$	277,149	$	205,452	31,678		$	514,279

Schedule of Acquired Intangible Assets

Acquired intangible assets consist of the following (in thousands):


	December 31, 2020				December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Indefinite-lived intangible assets:
Trademarks	$	56,570	$	—	$	32,570	$	—
Finite-lived intangible assets:
Trademarks	5,818		3,385		4,340		2,680
Unpatented technology	38,752		17,765		28,177		15,196
Customer relationships	98,500		31,580		55,401		26,028
Non-compete agreements	4,885		1,747		1,649		1,499
Backlog	7,228		911		—		—
	155,183		55,388		89,567		45,403
Total acquired intangible assets	$	211,753	$	55,388	$	122,137	$	45,403

Schedule of Intangible Assets Amortization Expense

The following table summarizes amortization expense for the years ended December 31 (in thousands):


	2020		2019		2018
Amortization expense	$	9,663	$	6,891	$	7,190

Schedule of Amortization Expense

Amortization expense related to acquired intangible assets for the next five years ended December 31 is estimated as follows (in thousands):


	2021		2022		2023		2024		2025
Amortization expense	$	18,362	$	11,584	$	10,721	$	10,611	$	10,382

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2020

Accrued Liabilities, Current [Abstract]

Accrued Expenses

Accrued expenses at December 31 consist of the following (in thousands):


	2020		2019
Compensation	$	18,131	$	13,509
Current portion of cash-settled share-based liabilities	3,504		14,817
Interest and taxes	1,850		3,569
Customer rebates	11,575		10,266
Insurance	6,915		8,353
Current operating lease liability	8,034		6,487

Unearned revenue	21,325		15,389

Other	12,171		14,207
Total accrued expenses	$	83,505	$	86,597

Debt (Tables)

12 Months Ended

Dec. 31, 2020

Long-term Debt, Unclassified [Abstract]

Schedule of Cash Paid for Interest

Total cash paid for interest in the years ended December 31 was (in thousands):


	2020		2019		2018
Interest expense, net	$	703	$	2,323	$	10,709
Interest income	276		764		2,156
Other non-cash adjustments	(345)		(380)		(529)
Cash paid for interest	$	634	$	2,707	$	12,336

Pension and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Total Expense for All Retirement Plans

Total expense for all retirement plans for the years ended December 31 was (in thousands):


	2020		2019		2018
401(k) plan	$	2,403	$	2,031	$	1,876
Multiemployer and other defined benefit and pension plans	70		195		239
Postretirement healthcare plan	351		346		427
Total retirement plan expense	$	2,824	$	2,572	$	2,542

Amounts Recognized in the Consolidated Financial Statements

Amounts recognized in the consolidated financial statements consisted of (in thousands):


	2020		2019
Accrued postretirement benefit liability
Current portion	$	335	$	330
Long term portion	6,108		5,694
Pre-tax accumulated other comprehensive loss – unamortized post-retirement healthcare costs	(2,137)		(1,666)
Net amount recognized	$	4,306	$	4,358

Other Postretirement Benefits

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Changes in the Accumulated Postretirement Benefit Obligation

The following table presents the changes in the accumulated postretirement benefit obligation related to the Company’s unfunded postretirement healthcare benefits at December 31 (in thousands):


	2020		2019
Projected benefit obligation at January 1	$	6,024	$	6,135
Service cost	10		17
Interest cost	172		234

Actuarial gain	580		(52)
Benefits paid, net of contributions	(343)		(310)
Projected benefit obligation at December 31	6,443		6,024
Fair value of plan assets	—		—
Under funded status	(6,443)		(6,024)
Unamortized prior service cost	294		338
Unrecognized actuarial loss	1,843		1,328
Net amount recognized	$	(4,306)	$	(4,358)

Schedule of Net Periodic Pension and Other Post-Retirement Benefit Costs

Components of net periodic postretirement benefit cost charged to expense for the years ended December 31 were as follows (in thousands):


	2020			2019			2018
Service cost	$	10		$	17		$	18
Interest cost	172			234			233
Amortization of unrecognized prior service cost	44			44			44
Loss amortization (2)	64			51			132
Net periodic benefit cost	$	290		$	346		$	427
Assumptions used to calculate the benefit obligation:
Discount rate	2.0		%	2.9		%	4.1		%
Annual rate of increase in the per capita cost of:
Medical costs before age 65 (1)	7.0		%	6.8		%	7.0		%
Medical costs after age 65 (1)	4.5		%	4.5		%	5.0		%
Prescription drug costs (1)	7.0		%	7.0		%	9.5		%

(1) It was assumed that these rates would gradually decline to 3.8% by 2075.

(2) Actuarial (gains)/losses are amortized utilizing the corridor approach. Differences between actual

Expected Benefit Payments from the Plan

Expected benefit payments from the plan for the years ended December 31 are as follows (in thousands):


	2021		2022		2023		2024		2025		Years 2026 - 2030
Expected benefit payments	$	335	$	349	$	358	$	366	$	376	$	1,910

Accumulated Other Comprehensive (Loss) Income (Tables)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Components of Accumulated Other Comprehensive (Loss) Income

The cumulative balance of each component of accumulated other comprehensive (loss) income is as follows (in thousands):


	Foreign Currency Translation Adjustment		Minimum post retirement benefit plan adjustments		Total Pre-Tax Amount		Tax (Benefit) Expense		Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939)	$	(2,040)	$	(7,979)	$	(745)	$	(7,234)
Minimum post retirement benefit plan adjustments	—		101		101		24		77

Foreign currency translation adjustment	1,766		—		1,766		—		1,766
Balance at December 31, 2019	$	(4,173)	$	(1,939)	$	(6,112)	$	(721)	$	(5,391)

Minimum post retirement benefit plan adjustments	—		(487)		(487)		(116)		(371)
Foreign currency translation adjustment	3,301		—		3,301		—		3,301
Balance at December 31, 2020	$	(872)	$	(2,426)	$	(3,298)	$	(837)	$	(2,461)

Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary of Compensation Expense Connection with Awards


	2020		2019		2018
Expense recognized under the Prior Plan	$	40	$	192	$	569
Expense recognized under the 2015 Plan	1,932		5,077		7,988
Expense recognized under the 2018 Plan	5,441		6,731		188
Expense recognized under the Non-Employee Directors Plan	760		570		444
Total stock compensation expense	$	8,173	$	12,570	$	9,189
Tax benefits recognized related to stock compensation expense	$	2,272	$	3,136	$	2,509

Schedule of Number of Awards and Weighted Average Grant Date Fair Value


	2020			2019			2018
Awards	Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value		Number of Awards	Weighted Average Grant Date Fair Value


Deferred stock units	12,402	$	45.98	7,509	$	37.95	10,255	$	35.96
Common stock	4,134	$	45.98	7,509	$	37.95	2,113	$	35.50
Restricted stock units	81,397	$	56.81	152,472	$	39.73	116,174	$	36.61
Performance stock units	160,426	$	55.98	183,908	$	40.49	135,929	$	33.63

Summary of Ranges of Outstanding and Exercisable Options

The following table summarizes the ranges of outstanding and exercisable options at December 31, 2020:


Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price		Options Exercisable	Weighted Average Exercise Price
$8.00 – $10.00	16,500	0.7	$	9.74	16,500	$	9.74
$10.01 – $39.00	—	0	$	—	—	$	—
$39.01 – $44.00	25,000	1.4	$	42.35	25,000	$	42.35


	41,500				41,500

Summary of Stock Options Transactions

The following table summarizes information about stock option transactions:


	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Balance at January 1, 2018	247,666	$	17.01

Exercised	(87,907)	15.75

Balance at December 31, 2018	159,759	$	17.70


Exercised	(42,350)	11.57
Balance at December 31, 2019	117,409	$	19.91
Exercised	(75,909)	14.73
Balance at December 31, 2020	41,500	$	29.38	1.13	$	1,766,000

Summary of Information About Restricted Stock Units and Weighted Average Grant Date Fair Value

The following table summarizes information about non-vested restricted stock units, performance stock units (that will convert to shares upon vesting) and common stock:


	Restricted Stock Units	Weighted Average Grant Date Fair Value		Common Stock	Weighted Average Grant Date Fair Value		Performance Stock Units (1) (2)	Weighted Average Grant Date Fair Value		Deferred Stock Units (3)	Weighted Average Grant Date Fair Value
Balance at December 31, 2019	374,432	$	33.74	—	$	—	329,257	$	38.53	34,752	$	34.21
Granted	82,328	$	56.81	4,134	$	45.98	160,426	$	55.98	12,402	$	45.98
Adjustments	—	$	—	—	$	—	27,528	$	40.98	—	$	—
Vested	(213,448)	$	34.14	(4,134)	$	45.98	(81,366)	$	40.77	—	$	—
Forfeited	(5,870)	$	40.92	—	$	—	(28,556)	$	40.27	—	$	—
Balance at December 31, 2020	237,442	$	41.15	—	$	—	407,289	$	45.00	47,154	$	37.30

(3) Vested and issued upon termination from service as a member of the Company's Board of Directors.

Aggregate Intrinsic Value of Options Exercised and Aggregate Fair Value of Restricted Stock Units and Restricted Shares that Vested


	2020		2019		2018
Aggregate intrinsic value of options exercised	$	3,812	$	1,371	$	2,128
Aggregate fair value of vested restricted stock units	$	11,851	$	10,017	$	5,307
Aggregate fair value of vested common and restricted shares	$	190	$	285	$	149
Aggregate fair value of vested deferred stock units	$	570	$	285	$	369

Cash Paid to Settle Liability Awards


	2020		2019		2018
Restricted stock units credited	57,046		61,369		66,843
Restricted stock units balance, vested and unvested	231,343		415,760		387,870
Share-based liabilities paid, in thousands	$	15,401	$	6,543	$	5,232
MSPP expense, in thousands	$	4,518	$	2,699	$	4,809

Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2020

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Discontinued Operations

as assets and liabilities of discontinued operations held for sale. respectively, in the consolidated balance sheets at December 31, (in thousands):


	2020		2019
Assets
Accounts receivable, net	$	11,261	$	13,620
Inventories, net	13,041		16,519
Prepaid expenses and other current assets	21,310		789
Total current assets (1)	45,612		30,928
Property, plant, and equipment, net	16,999		17,257
Operating lease assets	6,470		6,461
Goodwill	22,475		22,350
Acquired intangibles	15,482		15,858
Loss recognized on classification as held for sale	(29,600)		—
Total noncurrent assets (1)	31,826		61,926
Total assets classified as held for sale	$	77,438	$	92,854

Liabilities
Accounts payable	$	10,708	$	10,508
Accrued expenses	9,274		11,866
Total current liabilities (1)	19,982		22,374
Deferred income taxes	24,657		4,930
Non-current operating lease liabilities	4,639		4,726
Other non-current liabilities	17		14
Total noncurrent liabilities (1)	29,313		9,670
Total liabilities classified as held for sale	$	49,295	$	32,044

Components of the (loss) income from discontinued operations before taxes, including the interest allocated to discontinued operations, for the years ended December 31 were as follows (in thousands):


	2020		2019		2018
Net sales	$	128,915	$	150,225	$	166,378
Operating expenses	115,822		143,335		151,924
Loss on classification as held for sale	29,600		—		—
Interest expense allocation	95		208		1,632
(Loss) income from discontinued operations before taxes	$	(16,602)	$	6,682	$	12,822

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 205
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760

+ Details

Exit Activity Costs and Asset Impairments (Tables)

12 Months Ended

Dec. 31, 2020

Restructuring and Related Activities [Abstract]

Reconciliation of Liability for Exit Activity Costs Relating to Facility Consolidation Efforts


	2020						2019				2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs		Total		Inventory write-downs &/or asset impairment (recoveries) charges, net		Exit activity costs		Total		Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net		Total
Renewable Energy & Conservation	$	72	$	875	$	947	$	(9)	$	66	$	57	$	105	$	(33)	$	72
Residential Products	9		731		740		417		3,440		3,857		1,586		1,321		2,907
Infrastructure Products	—		226		226		—		—		—		227		1,075		1,302
Corporate	—		375		375		—		1,660		1,660		—		438		438
Total exit activity costs & asset impairments	$	81	$	2,207	$	2,288	$	408	$	5,166	$	5,574	$	1,918	$	2,801	$	4,719

The following table reconciles the beginning and ending liability for exit activity costs relating to the Company’s facility consolidation efforts (in thousands):


	2020		2019
Balance as of January 1	$	2,083	$	1,865
Exit activity costs recognized	2,207		5,166
Cash payments	(3,260)		(3,799)
Non-cash charges	—		(1,149)
Balance as of December 31	$	1,030	$	2,083

Summary of Exit Activity Costs and Asset Impairments Recorded in the Consolidated Statements of Operations


	2020		2019		2018
Cost of sales	$	1,059	$	767	$	1,320
Selling, general, and administrative expense	1,229		4,807		3,399
Total exit activity costs and asset impairments	$	2,288	$	5,574	$	4,719

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of Income (Loss) Before Taxes from Continuing Operations

The components of income (loss) before taxes from continuing operations consisted of the following for the years ended December 31 (in thousands):


	2020		2019		2018
Domestic	$	108,930	$	78,351	$	70,783
Foreign	(1,171)		(270)		(3,660)
Income before taxes from continuing operations	$	107,759	$	78,081	$	67,123

Summary of Provision for Income Taxes for Continuing Operations

The provision for (benefit of) income taxes from continuing operations for the years ended December 31 consisted of the following (in thousands):


	2020		2019		2018
Current:
U.S. Federal	$	16,505	$	10,394	$	8,316
State	4,071		3,547		2,942
Foreign	106		92		(2,972)
Total current	20,682		14,033		8,286
Deferred:
U.S. Federal	3,620		3,740		4,253
State	672		486		853
Foreign	(506)		(106)		(381)
Total deferred	3,786		4,120		4,725
Provision for income taxes	$	24,468	$	18,153	$	13,011

(Benefit of) Provision for Income Taxes from Discontinued Operations

The provision for (benefit of) income taxes from discontinued operations for the years ended December 31 consisted of the following (in thousands):


	2020		2019		2018
Current:
U.S. Federal	$	1,345	$	885	$	1,086
State	57		4		202
Foreign	1,725		1,447		1,781
Total current	3,127		2,336		3,069
Deferred:
U.S. Federal	(876)		(823)		(95)
State	10		23		194
Foreign	(138)		(17)		(43)
Total deferred	(1,004)		(817)		56
Provision for income taxes	$	2,123	$	1,519	$	3,125

Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate

The provision for income taxes from continuing operations differs from the federal statutory rate of 21% due to the following (in thousands) for the years ended December 31:


	2020				2019				2018
Statutory rate	22,629		21.0	%	16,397		21.0	%	14,096		21.0	%
State taxes, less federal effect	3,650		3.4	%	3,194		4.1	%	2,901		4.3	%
Federal tax credits	(1,064)		(1.0)	%	(1,621)		(2.1)	%	(742)		(1.1)	%
Excess tax benefit on stock based compensation	(1,674)		(1.6)	%	(871)		(1.1)	%	(2,224)		(3.3)	%
Uncertain tax positions	—		—	%	(260)		(0.3)	%	(3,051)		(4.5)	%
Executive compensation	1,114		1.0	%	1,132		1.4	%	1,369		2.0	%
Change in valuation allowance	(130)		(0.1)	%	88		0.1	%	(1,694)		(2.5)	%
Net operating loss (NOL) write down	—		—	%	—		—	%	1,640		2.4	%
Change in Indemnification Asset	—		—	%	—		—	%	643		1.0	%









Other	(57)		—	%	94		0.1	%	73		0.1	%

	$	24,468	22.7	%	$	18,153	23.2	%	$	13,011	19.4	%

Deferred Tax Liabilities (Assets)

Deferred tax liabilities (assets) at December 31 consist of the following (in thousands):


	2020		2019
Depreciation	$	7,697	$	7,556
Goodwill	41,842		38,610
Intangible assets	5,632		6,171

Other	6,878		6,158
Gross deferred tax liabilities	62,049		58,495
Equity compensation	(7,496)		(9,530)
Other	(15,682)		(13,939)
Gross deferred tax assets	(23,178)		(23,469)
Valuation allowances	111		298
Deferred tax assets, net of valuation allowances	(23,067)		(23,171)
Net deferred tax liabilities	$	38,982	$	35,324

Summary of Valuation Allowance

The following sets forth a reconciliation of the beginning and ending amount of the Company’s valuation allowance (in thousands):


	2020		2019		2018
Balance as of January 1	$	298	$	206	$	2,002
Cost charged to the tax provision	70		100		45
Reductions	(248)		(10)		(1,747)

Currency translation	(9)		2		(94)
Balance as of December 31	$	111	$	298	$	206

Interest (Net of Federal Tax Benefit) and Penalties Recognized

Interest (net of federal tax benefit) and penalties recognized during the years ended December 31 were (in thousands):


	2020	2019	2018
Interest and penalties recognized as income	—	—	13

Income Taxes Paid, Net of Tax Refunds

The Company made net payments for income taxes for the following amounts for the years ended December 31 (in thousands):


	2020		2019		2018
Payments made for income taxes, net	$	21,351	$	16,744	$	14,128

Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):


	2020		2019		2018
Balance as of January 1	$	—	$	329	$	3,536
Additions for tax positions of the current year	—		—		15
Additions for tax positions of prior years	—		—		—
Reductions for tax positions of prior years for:
Settlements and changes in judgment	—		—		—
Lapses of applicable statute of limitations	—		(329)		(3,060)
Divestitures and foreign currency translation	—		—		(162)
Balance as of December 31	$	—	$	—	$	329

Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings per Share

Weighted average shares outstanding for basic and diluted earnings are as follows for the years ended December 31 (in thousands):


	2020		2019		2018
Numerator:
Income from continuing operations	$	83,291	$	59,928	$	54,112
(Loss) income from discontinued operations	(18,725)		5,163		9,697
Net income available to common shareholders	$	64,566	$	65,091	$	63,809
Denominator for basic earnings per share:
Weighted average shares outstanding	32,664		32,389		31,979
Denominator for diluted earnings per share:
Common stock options and stock units	254		333		555
Weighted average shares and conversions	32,918		32,722		32,534

Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Assets And Liabilities, Lessee


		2020		2019
Assets	Operating lease assets	$	25,229	$	21,201

Liabilities
Current	Accrued expenses	$	8,034	$	6,487
Non-current	Non-current operating lease liabilities	17,730		14,943
		$	25,764	$	21,430

Lease, Cost


	2020		2019
Operating lease cost	$	11,001	$	10,441
Cash paid for amounts included in the measurement of operating liabilities	$	9,502	$	9,238
Right-of-use assets obtained in exchange for new lease liabilities	$	12,745	$	6,364


Lease Term and Discount Rate	December 31, 2020			December 31, 2019
Weighted-average remaining lease term - operating leases	3.6		years	3.8		years
Weighted-average discount rate - operating leases	5.2	%		5.7	%

Lessee, Operating Lease, Liability, Maturity


Maturity of lease liabilities	(In thousands)
2021	$	9,139
2022	7,635
2023	6,483
2024	3,298
2025	1,043
After 2025	673
Total lease payments	28,271
Less: present value discount	(2,507)
Present value of lease liabilities	$	25,764

Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Measurements Used by Management to Assess Performance of Segments

The following table illustrates certain measurements used by management to assess the performance of the segments described above as of and for the years ended December 31 (in thousands):


	2020		2019		2018
Net sales:
Renewable Energy and Conservation	$	447,567	$	373,023	$	317,253
Residential Products	522,814		461,630		463,216
Infrastructure Products	62,197		63,580		56,628


Total consolidated net sales	$	1,032,578	$	898,233	$	837,097

Income from operations:
Renewable Energy and Conservation	$	40,738	$	47,558	$	37,423
Residential Products	94,430		63,047		69,838
Infrastructure Products	7,233		6,428		2,509
Segments income from operations	142,401		117,033		109,770
Unallocated corporate expenses	(35,211)		(36,221)		(28,629)
Total income from operations	$	107,190	$	80,812	$	81,141

Depreciation and Amortization
Renewable Energy and Conservation	$	9,445	$	6,132	$	5,790
Residential Products	8,110		7,906		8,217
Infrastructure Products	3,060		3,129		3,100
Unallocated corporate expenses	300		390		332
	$	20,915	$	17,557	$	17,439

Total assets
Renewable Energy and Conservation	$	619,071	$	246,853	$	218,048
Residential Products	407,132		359,657		361,499
Infrastructure Products	80,796		110,611		114,354
Unallocated corporate assets	28,057		174,475		271,616
Assets of discontinued operations	77,438		92,854		96,128
	$	1,212,494	$	984,450	$	1,061,645

Capital expenditures
Renewable Energy and Conservation	$	1,143	$	2,199	$	1,345
Residential Products	3,313		4,968		7,921
Infrastructure Products	1,511		1,028		927
Unallocated corporate expenditures	7,101		581		175
	$	13,068	$	8,776	$	10,368

Disaggregation of Revenue

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the years ended December 31 (in thousands):


	2020
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	75,727	$	518,281	$	22,781	$	616,789
Over Time	371,840		4,533		39,416		415,789
Total	$	447,567	$	522,814	$	62,197	$	1,032,578

	2019
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	42,596	$	458,006	$	26,490	$	527,092
Over Time	330,427		3,624		37,090		371,141
Total	$	373,023	$	461,630	$	63,580	$	898,233

	2018
	Renewable Energy and Conservation		Residential Products		Infrastructure Products		Total
Net sales:
Point in Time	$	33,427	$	460,513	$	22,806	$	516,746
Over Time	283,826		2,703		33,822		320,351
Total	$	317,253	$	463,216	$	56,628	$	837,097

Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile

Net sales by region or origin and long-lived assets by region of domicile for the years ended and as of December 31 are as follows (in thousands):


	2020		2019		2018
Net sales
North America	$	1,018,406	$	881,432	$	825,497

Asia	14,172		16,801		11,600
Total	$	1,032,578	$	898,233	$	837,097

Long-lived assets
North America	$	90,685	$	79,590	$	79,544

Asia	476		542		704
Total	$	91,161	$	80,132	$	80,248

Quarterly Unaudited Financial Data (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Unaudited Financial Information

GIBRALTAR INDUSTRIES, INC.

QUARTERLY UNAUDITED FINANCIAL DATA

(in thousands, except per share data)


	2020 Quarters Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	215,401	$	255,184	$	296,792	$	265,201	$	1,032,578
Gross profit	$	49,861	$	65,561	$	78,495	$	62,426	$	256,343
Income from continuing operations	$	12,777	$	30,748	$	40,943	$	22,722	$	107,190
Interest expense	$	44	$	222	$	217	$	220	$	703
Net income from continuing operations	$	9,902	$	24,457	$	31,334	$	17,598	$	83,291
Net income (loss) from discontinued operations	$	2,157	$	2,835	$	2,426	$	(26,143)	$	(18,725)
Total net income (loss)	$	12,059	$	27,292	$	33,760	$	(8,545)	$	64,566
Income per share from continuing operations:
Basic	$	0.30	$	0.75	$	0.96	$	0.54	$	2.55
Diluted	$	0.30	$	0.74	$	0.95	$	0.53	$	2.53
Income (loss) per share from discontinued operations:
Basic	$	0.07	$	0.09	$	0.07	$	(0.80)	$	(0.57)
Diluted	$	0.07	$	0.09	$	0.07	$	(0.79)	$	(0.57)


	2019 Quarters Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	187,160	$	224,255	$	260,784	$	226,034	$	898,233
Gross profit	$	37,259	$	56,468	$	68,744	$	57,426	$	219,897
Income from continuing operations	$	7,192	$	25,073	$	28,314	$	20,233	$	80,812
Interest expense (income)	$	2,000	$	249	$	79	$	(5)	$	2,323
Net income from continuing operations	$	4,131	$	18,803	$	21,951	$	15,043	$	59,928
Net income (loss) from discontinued operations	$	2,214	$	1,110	$	2,525	$	(686)	$	5,163
Total net income	$	6,345	$	19,913	$	24,476	$	14,357	$	65,091
Income per share from continuing operations:
Basic	$	0.13	$	0.58	$	0.68	$	0.46	$	1.85
Diluted	$	0.13	$	0.58	$	0.67	$	0.46	$	1.83
Income (loss) per share from discontinued operations:
Basic	$	0.07	$	0.04	$	0.07	$	(0.02)	$	0.16
Diluted	$	0.06	$	0.03	$	0.08	$	(0.02)	$	0.16

Summary of Significant Accounting Policies (Summary of Activity Recorded within the Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,951	$ 6,170	$ 5,599
Bad debt expense, net of recoveries	1,321	2,577	1,308
Accounts written off against allowance and other adjustments	(4,128)	(2,796)	(737)
Ending balance	3,529	5,951	$ 6,170
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 385
Ending balance		$ 385

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sale Leaseback Transaction [Line Items]
Advertising costs	$ 7.2	$ 5.7	$ 5.0
Minimum \| Land, Buildings and Improvements
Sale Leaseback Transaction [Line Items]
Estimated useful lives	15 years
Minimum \| Machinery and Equipment
Sale Leaseback Transaction [Line Items]
Estimated useful lives	3 years
Maximum \| Land, Buildings and Improvements
Sale Leaseback Transaction [Line Items]
Estimated useful lives	40 years
Maximum \| Machinery and Equipment
Sale Leaseback Transaction [Line Items]
Estimated useful lives	20 years
Residential Products \| Home Improvement Retail Company \| Accounts Receivable
Sale Leaseback Transaction [Line Items]
Concentrations of credit risk	11.00%	15.00%
Residential Products \| Home Improvement Retail Company \| Net sales
Sale Leaseback Transaction [Line Items]
Concentrations of credit risk	14.00%	14.00%	14.00%

Summary of Significant Accounting Policies (Summary of Interest Capitalized and Depreciation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Depreciation expense	$ 11,252	$ 10,666	$ 10,249

Summary of Significant Accounting Policies - Recent Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 469,943	$ 405,668
Income tax benefit		$ (24,468)	$ (18,153)	$ (13,011)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit	$ 96
Cumulative Effect, Period of Adoption, Adjustment \| Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (291)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Revenue - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Revenue - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Costs in excess of billings	$ 26,915	$ 20,607	$ 22,634
Unearned revenue	21,325	15,389
Billings in excess of cost
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unearned revenue	34,702	47,598	17,857
Unearned revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unearned revenue	21,325	$ 15,389	$ 10,847
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Costs in excess of billings	6,800
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC \| Billings in excess of cost
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unearned revenue	12,400
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC \| Unearned revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unearned revenue	$ 9,000
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract payment terms	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract payment terms	60 days
Remaining performance obligation expected timing of satisfaction	1 year

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Costs in excess of billings	$ 26,915	$ 20,607		$ 22,634
Contract with customer liability	(21,325)	(15,389)
Amounts included in billings in excess of cost at the beginning of the period	45,536	17,371	$ 10,097
Amounts included in unearned revenue at the beginning of the period	12,229	10,090	$ 2,988
Billings in excess of cost
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer liability	(34,702)	(47,598)		(17,857)
Unearned revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer liability	$ (21,325)	$ (15,389)		$ (10,847)

Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 174,604	$ 119,239
Costs in excess of billings	26,915	20,607
Total contract receivables	201,519	139,846
Less allowance for doubtful accounts	(3,529)	(5,951)	$ (6,170)	$ (5,599)
Accounts receivable	197,990	$ 133,895
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 62,000

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Raw material	$ 66,018	$ 42,030
Work-in-process	5,382	5,023
Finished goods	31,205	18,460
Gross inventory	102,605	65,513
Less reserves	(4,298)	(3,556)
Total inventories	98,307	$ 61,957
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC
Inventory [Line Items]
Total inventories	$ 30,000

Inventories (Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Inventory [Roll Forward]
Beginning balance	$ 3,463	$ 2,971	$ 2,852
Excess, obsolete and slow moving inventory expense	355	1,134	363
Scrapped inventory and other adjustments	(343)	642	244
Ending balance	$ 4,161	$ 3,463	$ 2,971

Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 4,605	$ 4,583
Building and improvements	41,164	39,901
Machinery and equipment	188,853	174,058
Construction in progress	10,458	5,131
Property, plant, and equipment, gross	245,080	223,673
Less: accumulated depreciation	(155,518)	(145,521)
Property, plant, and equipment, net	$ 89,562	$ 78,152

Acquisitions (Narrative) (Details) $ in Thousands							12 Months Ended
Acquisitions (Narrative) (Details) $ in Thousands	Dec. 11, 2020 USD ($)	Oct. 15, 2020 USD ($)	Feb. 13, 2020 USD ($)	Jan. 15, 2020 USD ($)	Aug. 30, 2019 USD ($)	Aug. 21, 2018 USD ($)	Dec. 31, 2020 USD ($) business	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired \| business							5
Goodwill							$ 514,279	$ 307,355	$ 301,580
Renewable Energy & Conservation
Business Acquisition [Line Items]
Number of businesses acquired \| business							4
Residential Products
Business Acquisition [Line Items]
Number of businesses acquired \| business							1
Apeks
Business Acquisition [Line Items]
Acquisition purchase price					$ 12,600
Goodwill					$ 6,436
SolarBOS
Business Acquisition [Line Items]
Acquisition purchase price						$ 6,400
Goodwill						$ 2,879
Thermo Energy Systems Inc., Delta Separations, LLC, Architectural Mailboxes LLC , Sunfig Corporation, and TerraSmart LLC
Business Acquisition [Line Items]
Acquisition purchase price							$ 313,300
TerraSmart LLC
Business Acquisition [Line Items]
Acquisition purchase price							228,200
Goodwill							$ 143,245
Sunfig Corporation
Business Acquisition [Line Items]
Acquisition purchase price	$ 3,800
Goodwill	$ 3,200
Architectural Mailboxes LLC
Business Acquisition [Line Items]
Acquisition purchase price		$ 26,900
Goodwill		$ 7,400
Delta Separations, LLC
Business Acquisition [Line Items]
Acquisition purchase price			$ 47,100
Goodwill			$ 32,200
Thermo Energy Systems
Business Acquisition [Line Items]
Acquisition purchase price				$ 7,300
Goodwill				$ 18,700

Acquisitions (Schedule of Allocation of the Purchase Price Consideration of the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 15, 2020	Dec. 31, 2019	Aug. 30, 2019	Dec. 31, 2018	Aug. 21, 2018
Business Acquisition [Line Items]
Goodwill	$ 514,279		$ 307,355		$ 301,580
TerraSmart LLC
Business Acquisition [Line Items]
Cash	1,712
Working capital	23,833
Property, plant, and equipment	8,345
Acquired intangible assets	51,700
Other assets	1,478
Other liabilities	(2,081)
Goodwill	143,245
Fair value of purchase consideration	$ 228,232
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc.
Business Acquisition [Line Items]
Cash		$ 145
Working capital		(14,930)
Property, plant, and equipment		1,740
Acquired intangible assets		38,296
Other current assets		1,528
Other assets		2,381
Other liabilities		(5,508)
Goodwill		61,436
Fair value of purchase consideration		$ 85,088
Apeks
Business Acquisition [Line Items]
Cash				$ 4,154
Working capital				(1,515)
Property, plant, and equipment				1,059
Acquired intangible assets				3,000
Other assets				508
Other liabilities				(1,081)
Goodwill				6,436
Fair value of purchase consideration				$ 12,561
SolarBOS
Business Acquisition [Line Items]
Cash						$ 915
Working capital						680
Property, plant, and equipment						483
Acquired intangible assets						1,450
Other assets						13
Other liabilities						(51)
Goodwill						2,879
Fair value of purchase consideration						$ 6,369

Acquisitions (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands			12 Months Ended
	Aug. 30, 2019	Aug. 21, 2018	Dec. 31, 2020
TerraSmart LLC
Business Acquisition [Line Items]
Fair Value			$ 51,700
TerraSmart LLC \| Trademarks
Business Acquisition [Line Items]
Fair Value			16,400
TerraSmart LLC \| Trademarks
Business Acquisition [Line Items]
Fair Value			$ 300
Weighted-Average Amortization Period			7 years
TerraSmart LLC \| Technology
Business Acquisition [Line Items]
Fair Value			$ 2,500
Weighted-Average Amortization Period			15 years
TerraSmart LLC \| Customer relationships
Business Acquisition [Line Items]
Fair Value			$ 24,000
Weighted-Average Amortization Period			10 years
TerraSmart LLC \| Non-compete agreements
Business Acquisition [Line Items]
Fair Value			$ 2,200
Weighted-Average Amortization Period			5 years
TerraSmart LLC \| Backlog
Business Acquisition [Line Items]
Fair Value			$ 6,300
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc.
Business Acquisition [Line Items]
Fair Value			38,296
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Trademarks
Business Acquisition [Line Items]
Fair Value			8,200
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Trademarks
Business Acquisition [Line Items]
Fair Value			$ 1,177
Weighted-Average Amortization Period			3 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Technology
Business Acquisition [Line Items]
Fair Value			$ 8,175
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Technology \| Minimum
Business Acquisition [Line Items]
Weighted-Average Amortization Period			7 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Technology \| Maximum
Business Acquisition [Line Items]
Weighted-Average Amortization Period			15 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Customer relationships
Business Acquisition [Line Items]
Fair Value			$ 18,780
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Customer relationships \| Minimum
Business Acquisition [Line Items]
Weighted-Average Amortization Period			5 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Customer relationships \| Maximum
Business Acquisition [Line Items]
Weighted-Average Amortization Period			13 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Non-compete agreements
Business Acquisition [Line Items]
Fair Value			$ 1,036
Weighted-Average Amortization Period			5 years
Sunfig Corporation, Architectural Mailboxes, LLC, Delta Separations, LLC, and Thermo Energy Systems Inc. \| Backlog
Business Acquisition [Line Items]
Fair Value			$ 928
Weighted-Average Amortization Period			1 year
Apeks
Business Acquisition [Line Items]
Fair Value	$ 3,000
Apeks \| Trademarks
Business Acquisition [Line Items]
Fair Value	1,400
Apeks \| Technology
Business Acquisition [Line Items]
Fair Value	$ 900
Weighted-Average Amortization Period	7 years
Apeks \| Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 700
Weighted-Average Amortization Period	6 years
SolarBOS
Business Acquisition [Line Items]
Fair Value		$ 1,450
SolarBOS \| Trademarks
Business Acquisition [Line Items]
Fair Value		$ 300
Weighted-Average Amortization Period		3 years
SolarBOS \| Technology
Business Acquisition [Line Items]
Fair Value		$ 450
Weighted-Average Amortization Period		9 years
SolarBOS \| Customer relationships
Business Acquisition [Line Items]
Fair Value		$ 700
Weighted-Average Amortization Period		9 years

Acquisitions (Acquisition Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Total acquisition related costs	$ 3,864	$ 1,918	$ 497
Cost of sales
Business Acquisition [Line Items]
Total acquisition related costs	634	401	0
Selling, general and administrative costs
Business Acquisition [Line Items]
Total acquisition related costs	$ 3,230	$ 1,517	$ 497

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at	$ 307,355	$ 301,580
Acquired goodwill	205,243	5,857
Adjustments to prior year acquisitions	578	(172)
Foreign currency translation	1,103	90
Balance at	514,279	307,355
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at	77,602	71,827
Acquired goodwill	197,866	5,857
Adjustments to prior year acquisitions	578	(172)
Foreign currency translation	1,103	90
Balance at	277,149	77,602
Residential Products
Goodwill [Roll Forward]
Balance at	198,075	198,075
Acquired goodwill	7,377	0
Adjustments to prior year acquisitions	0	0
Foreign currency translation	0	0
Balance at	205,452	198,075
Infrastructure Products
Goodwill [Roll Forward]
Balance at	31,678	31,678
Acquired goodwill	0	0
Adjustments to prior year acquisitions	0	0
Foreign currency translation	0	0
Balance at	$ 31,678	$ 31,678

Goodwill and Related Intangible Assets (Narrative) (Details)		12 Months Ended
	Oct. 31, 2017 reporting_unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Accumulated impairment losses		$ 133,200,000	$ 133,200,000
Goodwill impairment		$ 0	$ 0
Number of reporting units tested \| reporting_unit	10
Impairment of definite-lived intangibles				$ 300,000
Trademarks
Goodwill [Line Items]
Impairment of indefinite-lived intangibles				$ 1,200,000

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 155,183	$ 89,567
Total acquired intangible assets, Gross Carrying Amount	211,753	122,137
Accumulated Amortization, Finite-lived intangible assets	55,388	45,403
Total acquired intangible assets, Accumulated Amortization	55,388	45,403
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,818	4,340
Accumulated Amortization, Finite-lived intangible assets	3,385	2,680
Unpatented technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	38,752	28,177
Accumulated Amortization, Finite-lived intangible assets	17,765	15,196
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	98,500	55,401
Accumulated Amortization, Finite-lived intangible assets	31,580	26,028
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	4,885	1,649
Accumulated Amortization, Finite-lived intangible assets	1,747	1,499
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	7,228	0
Accumulated Amortization, Finite-lived intangible assets	911	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	56,570	32,570
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0

Goodwill and Related Intangible Assets (Schedule of Impairment Charges) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Impairment of definite-lived intangibles	$ 300
Trademarks
Finite-Lived Intangible Assets [Line Items]
Impairment of indefinite-lived intangibles	$ 1,200

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 9,663	$ 6,891	$ 7,190

Goodwill and Related Intangible Assets (Schedule of Future Amortization Expense) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	$ 18,362
2021	11,584
2022	10,721
2023	10,611
2024	$ 10,382

Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities, Current [Abstract]
Compensation	$ 18,131	$ 13,509
Current portion of cash-settled share-based liabilities	3,504	14,817
Interest and taxes	1,850	3,569
Customer rebates	11,575	10,266
Insurance	6,915	8,353
Current operating lease liability	8,034	6,487
Unearned revenue	21,325	15,389
Other	12,171	14,207
Total accrued expenses	$ 83,505	$ 86,597
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent

Debt (Narrative) (Details)	Jan. 24, 2019 USD ($)	Dec. 31, 2020 USD ($) debtCovenant	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Carrying value of outstanding debt		$ 85,600,000	$ 0
Number of debt covenants \| debtCovenant		3
Other Debt
Debt Instrument [Line Items]
Carrying value of outstanding debt		$ 600,000
Revolving Credit Facility \| 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Carrying value of outstanding debt		85,000,000.0
Current borrowing capacity	$ 400,000,000
Maximum borrowing capacity under the revolving credit facility	$ 700,000,000
Revolving Credit Facility \| 2019 Senior Credit Agreement \| Minimum
Debt Instrument [Line Items]
Annual commitment fee	0.15%
Revolving Credit Facility \| 2019 Senior Credit Agreement \| Minimum \| LIBOR
Debt Instrument [Line Items]
LIBOR floor, plus	1.125%
Revolving Credit Facility \| 2019 Senior Credit Agreement \| Maximum
Debt Instrument [Line Items]
Annual commitment fee	0.25%
Revolving Credit Facility \| 2019 Senior Credit Agreement \| Maximum \| LIBOR
Debt Instrument [Line Items]
LIBOR floor, plus	2.00%
Term Loan \| 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Term loan (up to)	$ 300,000,000
Standby Letters of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity under the revolving credit facility		5,800,000
Revolving Credit Facility \| Senior Credit Agreement
Debt Instrument [Line Items]
Carrying value of outstanding debt		85,000,000	0
Availability amount		$ 309,200,000	$ 394,000,000.0

Debt (Schedule of Cash Paid for Interest) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]
Interest expense, net	$ (220)	$ (217)	$ (222)	$ (44)	$ 5	$ (79)	$ (249)	$ (2,000)	$ (703)	$ (2,323)	$ (10,709)
Interest income									276	764	2,156
Other non-cash adjustments									(345)	(380)	(529)
Cash paid for interest									$ 634	$ 2,707	$ 12,336

Pension and Other Postretirement Benefits (Schedule of Total Expense for All Retirement Plans) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) plan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 2,824	$ 2,572	$ 2,542
401(k) plan
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	2,403	2,031	1,876
Multiemployer and other defined benefit and pension plans
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 70	195	239
Number of plans \| plan	1
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Total retirement plan expense	$ 351	$ 346	$ 427

Pension and Other Postretirement Benefits (Changes in the Accumulated Postretirement Benefit Obligation) (Details) - Other Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at	$ 6,024	$ 6,135
Service cost	10	17	$ 18
Interest cost	172	234	233
Actuarial losses (gains)	580	(52)
Benefits paid	(343)	(310)
Projected benefit obligation at	6,443	6,024	$ 6,135
Fair value of plan assets	0	0
Under funded status	(6,443)	(6,024)
Unamortized prior service cost	294	338
Unrecognized actuarial gain	1,843	1,328
Net amount recognized	$ (4,306)	$ (4,358)

Pension and Other Postretirement Benefits (Amounts Recognized in the Consolidated Financial Statements) (Details) - Other Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued post retirement liability: Current portion	$ 335	$ 330
Accrued post retirement liability: Long term portion	6,108	5,694
Pre-tax accumulated other comprehensive loss – unamortized post-retirement healthcare costs	2,137	1,666
Net amount recognized	$ 4,306	$ 4,358

Pension and Other Postretirement Benefits (Components of Net Periodic Postretirement Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Ultimate healthcare trend rates	3.80%
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 10	$ 17	$ 18
Interest cost	172	234	233
Amortization of unrecognized prior service cost	44	44	44
Loss amortization (2)	64	51	132
Net periodic pension cost	$ 290	$ 346	$ 427
Discount rate	2.00%	2.90%	4.10%
Annual rate of increase in the per capita cost of: Medical costs before age 65	7.00%	6.80%	7.00%
Annual rate of increase in the per capita cost of: Medical costs after age 65	4.50%	4.50%	5.00%
Annual rate of increase in the per capita cost of: Prescription drug costs	7.00%	7.00%	9.50%

Pension and Other Postretirement Benefits (Expected Benefit Payments from the Plan) (Details) - Unamortized Post-Retirement Health Care Costs $ in Thousands	Dec. 31, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	$ 335
2022	349
2023	358
2024	366
2025	376
Years 2026 - 2030	$ 1,910

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (6,112)	$ (7,979)
Balance at end of period	(3,298)	(6,112)	$ (7,979)
Tax (Benefit) Expense
Balance at beginning of period	(721)	(745)
Minimum post retirement benefit plan adjustments	(116)	24
Balance at end of period	(837)	(721)	(745)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(5,391)	(7,234)
Minimum post retirement benefit plan adjustments	(371)	77
Foreign currency translation adjustment	(2,930)	(1,843)	2,868
Balance at end of period	(2,461)	(5,391)	(7,234)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(4,173)	(5,939)
Other Comprehensive Income (Loss), before Tax	3,301	1,766
Balance at end of period	(872)	(4,173)	(5,939)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign currency translation adjustment	3,301	1,766
Minimum post retirement benefit plan adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,939)	(2,040)
Other Comprehensive Income (Loss), before Tax	487	(101)
Balance at end of period	$ (2,426)	$ (1,939)	$ (2,040)

Equity-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 04, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	0
Market price of common stock, per share	$ 71.94
Unrecognized compensation cost	$ 14.1
Weighted average cost recognition period, in years	2 years 3 months 18 days
Accrued equity based compensation	$ 18.2	$ 28.0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Typical vesting period, in years	4 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	160,426
Forfeited in period (in shares)	28,556
Performance stock units outstanding (in shares)	407,289	329,257
2018 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized				1,000,000
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance under the Plan	513,000
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance under the Plan	136,000
Non-Employee Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance under the Plan	29,000
Accrued Expenses, Current
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 3.5
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 14.7	$ 13.2

Equity-Based Compensation (Summary of Compensation Expense Connection with Awards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Prior Plan	$ 40	$ 192	$ 569
Expense recognized under the Non-Employee Directors Plan	760	570	444
Total stock compensation expense	8,173	12,570	9,189
Tax benefits recognized related to stock compensation expense	2,272	3,136	2,509
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Plan	1,932	5,077	7,988
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized under the Plan	$ 5,441	$ 6,731	$ 188

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	12,402
Weighted Average Grant Date Fair Value (in USD per share)	$ 45.98
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	4,134
Weighted Average Grant Date Fair Value (in USD per share)	$ 45.98
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	82,328
Weighted Average Grant Date Fair Value (in USD per share)	$ 56.81
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	160,426
Weighted Average Grant Date Fair Value (in USD per share)	$ 55.98
2019 \| Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	12,402
Weighted Average Grant Date Fair Value (in USD per share)	$ 45.98
2019 \| Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	4,134
Weighted Average Grant Date Fair Value (in USD per share)	$ 45.98
2019 \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	81,397
Weighted Average Grant Date Fair Value (in USD per share)	$ 56.81
2019 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)	160,426
Weighted Average Grant Date Fair Value (in USD per share)	$ 55.98
2018 \| Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)		7,509
Weighted Average Grant Date Fair Value (in USD per share)		$ 37.95
2018 \| Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)		7,509
Weighted Average Grant Date Fair Value (in USD per share)		$ 37.95
2018 \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)		152,472
Weighted Average Grant Date Fair Value (in USD per share)		$ 39.73
2018 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)		183,908
Weighted Average Grant Date Fair Value (in USD per share)		$ 40.49
2017 \| Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)			10,255
Weighted Average Grant Date Fair Value (in USD per share)			$ 35.96
2017 \| Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)			2,113
Weighted Average Grant Date Fair Value (in USD per share)			$ 35.50
2017 \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)			116,174
Weighted Average Grant Date Fair Value (in USD per share)			$ 36.61
2017 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards (in shares)			135,929
Weighted Average Grant Date Fair Value (in USD per share)			$ 33.63

Equity-Based Compensation (Summary of Ranges of Outstanding and Exercisable Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding	41,500	159,759	117,409	247,666
Weighted Average Remaining Contractual Life (in years)	1 year 1 month 17 days
Weighted Average Exercise Price	$ 14.73	$ 15.75
Options Exercisable	41,500
$8.00 – $10.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 8.00
Exercise Price Range, Upper Range Limit	$ 10.00
Options Outstanding	16,500
Weighted Average Remaining Contractual Life (in years)	8 months 12 days
Weighted Average Exercise Price	$ 9.74
Options Exercisable	16,500
Weighted Average Exercise Price	$ 9.74
$10.01 – $39.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	10.01
Exercise Price Range, Upper Range Limit	$ 39.00
Options Outstanding	0
Weighted Average Remaining Contractual Life (in years)	0 years
Weighted Average Exercise Price	$ 0
Options Exercisable	0
Weighted Average Exercise Price	$ 0
$39.01 – $44.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	39.01
Exercise Price Range, Upper Range Limit	$ 44.00
Options Outstanding	25,000
Weighted Average Remaining Contractual Life (in years)	1 year 4 months 24 days
Weighted Average Exercise Price	$ 42.35
Options Exercisable	25,000
Weighted Average Exercise Price	$ 42.35

Equity-Based Compensation (Summary of Stock Option Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Options (in shares):
Beginning balance (in shares)	117,409	159,759	247,666
Exercised (in shares)	(75,909)		(87,907)
Forfeited (in shares)		(42,350)
Ending balance (in shares)	41,500	117,409	159,759
Weighted Average Exercise Price (in dollars per share)
Begininng balance (in dollars per share)	$ 19.91	$ 17.70	$ 17.01
Exercised (in dollars per share)	14.73		15.75
Forfeited (in dollars per share)		11.57
Ending balance (in dollars per share)	$ 29.38	$ 19.91	$ 17.70
Weighted Average Remaining Contractual Life (in years)	1 year 1 month 17 days
Aggregate Intrinsic Value	$ 1,766

Equity-Based Compensation (Summary of Information about Restricted Stock Units and Weighted Average Grant Date Fair Value) (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted stock units
Restricted Stock Units / Restricted Stock (in shares)
Balance at beginning of period (in shares) \| shares	374,432
Granted (in shares) \| shares	82,328
Vested (in shares) \| shares	(213,448)
Forfeited (in shares) \| shares	(5,870)
Balance at end of period (in shares) \| shares	237,442
Weighted Average Grant Date Fair Value (in dollars per share)
Balance at beginning of period (in USD per share) \| $ / shares	$ 33.74
Granted (in USD per share) \| $ / shares	56.81
Vested (in USD per share) \| $ / shares	34.14
Forfeited (in USD per share) \| $ / shares	40.92
Balance at end of period (in USD per share) \| $ / shares	$ 41.15
Common stock
Restricted Stock Units / Restricted Stock (in shares)
Balance at beginning of period (in shares) \| shares	0
Granted (in shares) \| shares	4,134
Vested (in shares) \| shares	(4,134)
Forfeited (in shares) \| shares	0
Balance at end of period (in shares) \| shares	0
Weighted Average Grant Date Fair Value (in dollars per share)
Balance at beginning of period (in USD per share) \| $ / shares	$ 0
Granted (in USD per share) \| $ / shares	45.98
Vested (in USD per share) \| $ / shares	45.98
Forfeited (in USD per share) \| $ / shares	0
Balance at end of period (in USD per share) \| $ / shares	$ 0
Performance stock units
Restricted Stock Units / Restricted Stock (in shares)
Balance at beginning of period (in shares) \| shares	329,257
Granted (in shares) \| shares	160,426
Vested (in shares) \| shares	(81,366)
Forfeited (in shares) \| shares	(28,556)
Balance at end of period (in shares) \| shares	407,289
Weighted Average Grant Date Fair Value (in dollars per share)
Balance at beginning of period (in USD per share) \| $ / shares	$ 38.53
Granted (in USD per share) \| $ / shares	55.98
Vested (in USD per share) \| $ / shares	40.77
Forfeited (in USD per share) \| $ / shares	40.27
Balance at end of period (in USD per share) \| $ / shares	$ 45.00
Deferred Stock Units
Restricted Stock Units / Restricted Stock (in shares)
Balance at beginning of period (in shares) \| shares	34,752
Granted (in shares) \| shares	12,402
Vested (in shares) \| shares	0
Forfeited (in shares) \| shares	0
Balance at end of period (in shares) \| shares	47,154
Weighted Average Grant Date Fair Value (in dollars per share)
Balance at beginning of period (in USD per share) \| $ / shares	$ 34.21
Granted (in USD per share) \| $ / shares	45.98
Vested (in USD per share) \| $ / shares	0
Forfeited (in USD per share) \| $ / shares	0
Balance at end of period (in USD per share) \| $ / shares	$ 37.30
Minimum \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Percent of grants awarded based on target threshold	0.00%
Maximum \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Percent of grants awarded based on target threshold	200.00%
2015 Equity Incentive Plan \| Return On Invested Capital \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Award performance period	1 year
2015 Equity Incentive Plan \| Gross Profit Threshold \| Minimum \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Award performance period	2 years
2015 Equity Incentive Plan \| Gross Profit Threshold \| Maximum \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Award performance period	3 years
2015 Equity Incentive Plan \| Total Shareholder Return \| Performance stock units
Weighted Average Grant Date Fair Value (in dollars per share)
Award performance period	3 years

Equity-Based Compensation (Aggregate Intrinsic Value of Options Exercised and Aggregate Fair Value of Restricted Stock Units and Restricted Shares that Vested) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised	$ 3,812	$ 1,371	$ 2,128
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	11,851	10,017	5,307
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	190	285	149
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	$ 570	$ 285	$ 369

Equity-Based Compensation (Cash Paid to Settle Liability Awards) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
MSPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units credited	$ 15,401	$ 6,543	$ 5,232
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units credited (in shares)	57,046	61,369	66,843
Restricted stock units balance, vested and unvested (in shares)	231,343	415,760	387,870
Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
MSPP expense, in thousands	$ 4,518	$ 2,699	$ 4,809

Fair Value Measurements (Narrative) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Extinguishment of Debt [Line Items]
Carrying value of outstanding debt	$ 85,600,000	$ 0
Revolving Credit Facility \| Senior Credit Agreement
Extinguishment of Debt [Line Items]
Carrying value of outstanding debt	$ 85,000,000	$ 0

Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Assets of discontinued operations	$ 77,438	$ 30,928
Total noncurrent assets	0	61,926
Liabilities
Total current liabilities	49,295	22,374
Total noncurrent liabilities	0	9,670
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Loss on classification as held for sale	(1,881)	0	$ 0
(Loss) income from discontinued operations before taxes	(16,602)	6,682	12,822
Industrial Business Segment
Assets
Total assets classified as held for sale	77,438	92,854
Liabilities
Total liabilities classified as held for sale	49,295	32,044
Discontinued Operations, Held-for-sale \| Industrial Business Segment
Assets
Accounts receivable, net	11,261	13,620
Inventories, net	13,041	16,519
Prepaid expenses and other current assets	21,310	789
Assets of discontinued operations	45,612	30,928
Property, plant, and equipment, net	16,999	17,257
Operating lease assets	6,470	6,461
Goodwill	22,475	22,350
Acquired intangibles	15,482	15,858
Loss recognized on classification as held for sale	(29,600)	0
Total noncurrent assets	31,826	61,926
Liabilities
Accounts payable	10,708	10,508
Accrued expenses	9,274	11,866
Total current liabilities	19,982	22,374
Deferred income taxes	24,657	4,930
Non-current operating lease liabilities	4,639	4,726
Other non-current liabilities	17	14
Total noncurrent liabilities	29,313	9,670
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales	128,915	150,225	166,378
Operating expenses	115,822	143,335	151,924
Loss on classification as held for sale	29,600	0	0
Interest expense allocation	95	208	1,632
(Loss) income from discontinued operations before taxes	$ (16,602)	$ 6,682	$ 12,822

Exit Activity Costs and Asset Impairments (Narrative) (Details) $ in Thousands		12 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) facility	Dec. 31, 2019 USD ($) facility	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of consolidated facilities to be closed \| facility		2	1
Gain on sale of business		$ 1,881	$ 0	$ 0
Apartment Tour Application Business
Restructuring Cost and Reserve [Line Items]
Cash proceeds from sale of business	$ 2,000
Gain on sale of business	$ 1,900

Exit Activity Costs and Asset Impairments (Schedule Of Asset Impairment Charges Related To Restructuring Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	$ 81	$ 408	$ 1,918
Exit activity costs	2,207	5,166	2,801
Total exit activity costs & asset impairments	2,288	5,574	4,719
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0
Exit activity costs	375	1,660	438
Total exit activity costs & asset impairments	375	1,660	438
Renewable Energy & Conservation \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	72	(9)	105
Exit activity costs	875	66	(33)
Total exit activity costs & asset impairments	947	57	72
Residential Products \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	9	417	1,586
Exit activity costs	731	3,440	1,321
Total exit activity costs & asset impairments	740	3,857	2,907
Infrastructure Products \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	227
Exit activity costs	226	0	1,075
Total exit activity costs & asset impairments	$ 226	$ 0	$ 1,302

Exit Activity Costs and Asset Impairments (Summary Of Exit Activity Costs And Asset Impairments Recorded in the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	$ 2,288	$ 5,574	$ 4,719
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	1,059	767	1,320
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	$ 1,229	$ 4,807	$ 3,399

Exit Activity Costs and Asset Impairments (Reconciles Of Liability For Exit Activity Costs Relating To Facility Consolidation Efforts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Balance as of	$ 2,083	$ 1,865
Exit activity costs recognized	2,207	5,166	$ 2,801
Cash payments	(3,260)	(3,799)
Non-cash charges	0	(1,149)
Balance as of	$ 1,030	$ 2,083	$ 1,865

Income Taxes (Components of Income (Loss) before Taxes from Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 108,930	$ 78,351	$ 70,783
Foreign	(1,171)	(270)	(3,660)
Income before taxes	$ 107,759	$ 78,081	$ 67,123

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 940
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-Section 25
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
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-Subparagraph (SX 210.7-04(8))
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Income Taxes (Benefit of) Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Provision for income taxes	$ 2,123	$ 1,519	$ 3,125
Deferred:
Total deferred	3,786	4,120	4,725
Provision for income taxes	24,468	18,153	13,011
Continuing Operations
Current:
U.S. Federal	16,505	10,394	8,316
State	4,071	3,547	2,942
Foreign	106	92	(2,972)
Total current	20,682	14,033	8,286
Deferred:
U.S. Federal	3,620	3,740	4,253
State	672	486	853
Foreign	(506)	(106)	(381)
Total deferred	3,786	4,120	4,725
Provision for income taxes	24,468	18,153	13,011
Discontinued Operations
Current:
U.S. Federal	1,345	885	1,086
State	57	4	202
Foreign	1,725	1,447	1,781
Total current	3,127	2,336	3,069
Provision for income taxes	2,123	1,519	3,125
Deferred:
U.S. Federal	(876)	(823)	(95)
State	10	23	194
Foreign	(138)	(17)	(43)
Total deferred	$ (1,004)	$ (817)	$ 56

Income Taxes (Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory rate	$ 22,629	$ 16,397	$ 14,096
State taxes, less federal effect	3,650	3,194	2,901
Federal tax credits	(1,064)	(1,621)	(742)
Excess tax benefit on stock based compensation	(1,674)	(871)	(2,224)
Uncertain tax positions	0	(260)	(3,051)
Executive compensation	1,114	1,132	1,369
Change in valuation allowance	(130)	88	(1,694)
Net operating loss (NOL) write down	0	0	1,640
Change in Indemnification Asset	0	0	643
Other	(57)	94	73
Provision for income taxes	$ 24,468	$ 18,153	$ 13,011
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21.00%	21.00%	21.00%
State taxes, less federal effect	3.40%	4.10%	4.30%
Federal tax credits	(1.00%)	(2.10%)	(1.10%)
Excess tax benefit on stock based compensation	(1.60%)	(1.10%)	(3.30%)
Uncertain tax positions	0.00%	(0.30%)	(4.50%)
Executive compensation	1.00%	1.40%	2.00%
Change in valuation allowance	(0.10%)	0.10%	(2.50%)
Net operating loss (NOL) write down	0.00%	0.00%	2.40%
Change in Indemnification Asset	0.00%	0.00%	1.00%
Other	0.00%	0.10%	0.10%
Effective income tax rate, percentage	22.70%	23.20%	19.40%

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Statutory tax rate, percentage	21.00%	21.00%	21.00%
Deferred tax assets, net of operating losses	$ 14,700
Deferred tax assets, net of operating losses	1,500
Undistributed earnings of foreign subsidiaries	200
Lapses of applicable statute of limitations	$ 0	$ 329	$ 3,060
Minimum
Operating Loss Carryforwards [Line Items]
Statute of limitations expiration period, in years	4 years
Maximum
Operating Loss Carryforwards [Line Items]
Statute of limitations expiration period, in years	10 years
Federal
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of operating losses	$ 500
Deferred tax assets, net of operating losses	100
State
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of operating losses	10,200
Deferred tax assets, net of operating losses	300
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of operating losses	4,000
Deferred tax assets, net of operating losses	$ 1,100
Germany and Brazil
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of operating losses		$ 1,700

Income Taxes (Deferred Tax Liabilities (Assets)) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Depreciation	$ 7,697	$ 7,556
Goodwill	41,842	38,610
Intangible assets	5,632	6,171
Other	6,878	6,158
Gross deferred tax liabilities	62,049	58,495
Equity compensation	(7,496)	(9,530)
Other	(15,682)	(13,939)
Gross deferred tax assets	(23,178)	(23,469)
Valuation allowances	111	298
Deferred tax assets, net of valuation allowances	(23,067)	(23,171)
Net deferred tax liabilities	$ 38,982	$ 35,324

Income Taxes (Summary of Valuation Allowance) (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of January 1	$ 298	$ 206	$ 2,002
Cost charged to the tax provision	70	100	45
Currency translation	(248)	(10)	(1,747)
Currency translation	(9)	2	(94)
Balance as of December 31	$ 111	$ 298	$ 206

Income Taxes (Interest (Net of Federal Tax Benefit) and Penalties Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Interest and penalties recognized as income	$ 0	$ 0	$ 13

Income Taxes (Income Taxes Paid, Net of Tax Refunds) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Payments made for income taxes, net	$ 21,351	$ 16,744	$ 14,128

Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1	$ 0	$ 329	$ 3,536
Additions for tax positions of the current year	0	0	15
Additions for tax positions of prior years	0	0	0
Settlements and changes in judgment	0	0	0
Lapses of applicable statute of limitations	0	(329)	(3,060)
Divestitures and foreign currency translation	0	0	(162)
Balance as of December 31	$ 0	$ 0	$ 329

Earnings per Share (Narrative) (Details) - shares	12 Months Ended
Earnings per Share (Narrative) (Details) - shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive number of shares	13,000	30,000	303,000

Earnings per Share (Schedule of Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Income from continuing operations	$ 17,598	$ 31,334	$ 24,457	$ 9,902	$ 15,043	$ 21,951	$ 18,803	$ 4,131	$ 83,291	$ 59,928	$ 54,112
(Loss) income from discontinued operations	(26,143)	2,426	2,835	2,157	(686)	2,525	1,110	2,214	(18,725)	5,163	9,697
Net income	$ (8,545)	$ 33,760	$ 27,292	$ 12,059	$ 14,357	$ 24,476	$ 19,913	$ 6,345	$ 64,566	$ 65,091	$ 63,809
Weighted average shares outstanding (in shares)									32,664	32,389	31,979
Common stock options and restricted stock (in shares)									254	333	555
Weighted average shares and conversions (in shares)									32,918	32,722	32,534

- Definition

Amount after tax of income (loss) from continuing operations attributable to the parent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 260
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

+ Details

- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Leases - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 596,693	$ 743,805	$ 673,964		$ 531,719
Rent expense	9,700
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	1,582		(291)		274
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term		1 month
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term		15 years
Retained Earnings
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	338,995	$ 469,943	405,668		274,562
Retained Earnings \| Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 1,582		$ (291)		$ 624
Accounting Standards Update 2016-02 \| Retained Earnings \| Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ 1,600

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Leases - Assets and Liabilities of Lessee (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 25,229	$ 21,201
Current operating lease liability	8,034	6,487
Non-current operating lease liabilities	17,730	14,943
Total operating lease liability	$ 25,764	$ 21,430

Leases - Schedule of Lease Cost and Assumptions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 11,001	$ 10,441
Cash paid for amounts included in the measurement of operating liabilities	9,502	9,238
Right-of-use assets obtained in exchange for new lease liabilities	$ 12,745	$ 6,364
Weighted-average remaining lease term - operating leases	3 years 7 months 6 days	3 years 9 months 18 days
Weighted-average discount rate - operating leases	5.20%	5.70%

Leases - Maturity of Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
2021	$ 9,139
2022	7,635
2023	6,483
2024	3,298
2025	1,043
After 2025	673
Total lease payments	28,271
Less: present value discount	(2,507)
Present value of lease liabilities	$ 25,764	$ 21,430

Segment Information (Narrative) (Details)	12 Months Ended
Segment Information (Narrative) (Details)	Dec. 31, 2020 segment
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Number of reportable segments	3

Segment Information (Measurements Used by Management to Assess Performance of Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 265,201	$ 296,792	$ 255,184	$ 215,401	$ 226,034	$ 260,784	$ 224,255	$ 187,160	$ 1,032,578	$ 898,233	$ 837,097
Income from operations:	22,722	$ 40,943	$ 30,748	$ 12,777	20,233	$ 28,314	$ 25,073	$ 7,192	107,190	80,812	81,141
Depreciation and amortization									20,915	17,557	17,439
Total assets	1,212,494				984,450				1,212,494	984,450	1,061,645
Capital expenditures									13,068	8,776	10,368
Discontinued Operations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	77,438				92,854				77,438	92,854	96,128
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income from operations:									142,401	117,033	109,770
Unallocated Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income from operations:									(35,211)	(36,221)	(28,629)
Depreciation and amortization									300	390	332
Total assets	28,057				174,475				28,057	174,475	271,616
Capital expenditures									7,101	581	175
Renewable Energy & Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									447,567	373,023	317,253
Renewable Energy & Conservation \| Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									447,567	373,023	317,253
Income from operations:									40,738	47,558	37,423
Depreciation and amortization									9,445	6,132	5,790
Total assets	619,071				246,853				619,071	246,853	218,048
Capital expenditures									1,143	2,199	1,345
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									522,814	461,630	463,216
Residential Products \| Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									522,814	461,630	463,216
Income from operations:									94,430	63,047	69,838
Depreciation and amortization									8,110	7,906	8,217
Total assets	407,132				359,657				407,132	359,657	361,499
Capital expenditures									3,313	4,968	7,921
Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									62,197	63,580	56,628
Infrastructure Products \| Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:									62,197	63,580	56,628
Income from operations:									7,233	6,428	2,509
Depreciation and amortization									3,060	3,129	3,100
Total assets	$ 80,796				$ 110,611				80,796	110,611	114,354
Capital expenditures									$ 1,511	$ 1,028	$ 927

Segment Information (Net Sales by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales:	$ 265,201	$ 296,792	$ 255,184	$ 215,401	$ 226,034	$ 260,784	$ 224,255	$ 187,160	$ 1,032,578	$ 898,233	$ 837,097
Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:									447,567	373,023	317,253
Residential Products
Disaggregation of Revenue [Line Items]
Net sales:									522,814	461,630	463,216
Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:									62,197	63,580	56,628
Point in Time
Disaggregation of Revenue [Line Items]
Net sales:									616,789	527,092	516,746
Point in Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:									75,727	42,596	33,427
Point in Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:									518,281	458,006	460,513
Point in Time \| Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:									22,781	26,490	22,806
Over Time
Disaggregation of Revenue [Line Items]
Net sales:									415,789	371,141	320,351
Over Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:									371,840	330,427	283,826
Over Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:									4,533	3,624	2,703
Over Time \| Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:									$ 39,416	$ 37,090	$ 33,822

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Segment Information (Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales:	$ 265,201	$ 296,792	$ 255,184	$ 215,401	$ 226,034	$ 260,784	$ 224,255	$ 187,160	$ 1,032,578	$ 898,233	$ 837,097
Long-lived assets	91,161				80,132				91,161	80,132	80,248
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales:									1,018,406	881,432	825,497
Long-lived assets	90,685				79,590				90,685	79,590	79,544
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales:									14,172	16,801	11,600
Long-lived assets	$ 476				$ 542				$ 476	$ 542	$ 704

- Definition

+ References

+ Details

Quarterly Unaudited Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales:	$ 265,201	$ 296,792	$ 255,184	$ 215,401	$ 226,034	$ 260,784	$ 224,255	$ 187,160	$ 1,032,578	$ 898,233	$ 837,097
Gross profit	62,426	78,495	65,561	49,861	57,426	68,744	56,468	37,259	256,343	219,897	210,926
Income from operations:	22,722	40,943	30,748	12,777	20,233	28,314	25,073	7,192	107,190	80,812	81,141
Interest expense, net	220	217	222	44	(5)	79	249	2,000	703	2,323	10,709
Income from continuing operations	17,598	31,334	24,457	9,902	15,043	21,951	18,803	4,131	83,291	59,928	54,112
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(26,143)	2,426	2,835	2,157	(686)	2,525	1,110	2,214	(18,725)	5,163	9,697
Net income	$ (8,545)	$ 33,760	$ 27,292	$ 12,059	$ 14,357	$ 24,476	$ 19,913	$ 6,345	$ 64,566	$ 65,091	$ 63,809
Income per share from continuing operations:
Basic (in dollars per share)	$ 0.54	$ 0.96	$ 0.75	$ 0.30	$ 0.46	$ 0.68	$ 0.58	$ 0.13	$ 2.55	$ 1.85	$ 1.69
Diluted (in dollars per share)	0.53	0.95	0.74	0.30	0.46	0.67	0.58	0.13	2.53	1.83	1.66
Income (loss) per share from discontinued operations:
Basic (in dollars per share)	(0.80)	0.07	0.09	0.07	(0.02)	0.07	0.04	0.07	(0.57)	0.16	0.31
Diluted (in dollars per share)	$ (0.79)	$ 0.07	$ 0.09	$ 0.07	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ (0.57)	$ 0.16	$ 0.30

Subsequent Events (Details) - USD ($) $ in Thousands		12 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Feb. 22, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Loss on classification as held for sale		$ (1,881)	$ 0	$ 0
Subsequent Event \| Industrial Business Segment \| Discontinued Operations, Disposed of by Sale
Subsequent Event [Line Items]
Net proceeds of sale of business	$ 38,000
Cash proceeds from sale of business	25,000
Seller note principal amount	13,000
Loss on classification as held for sale	$ 29,600