0000912562-19-000038 | 10-Q | XBRL Viewer

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Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2019	Oct. 24, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,272,420
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000912562
Current Fiscal Year End Date	--12-31

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net Sales	$ 299,236	$ 280,086	$ 789,308	$ 761,459
Cost of sales	222,658	209,807	605,272	572,359
Gross profit	76,578	70,279	184,036	189,100
Selling, general, and administrative expense	45,158	40,875	115,444	113,579
Income from operations	31,420	29,404	68,592	75,521
Interest expense	17	2,906	2,297	9,305
Other expense (income)	84	522	660	(50)
Income before taxes	31,319	25,976	65,635	66,266
Provision for income taxes	6,843	6,473	14,901	15,574
Net income	$ 24,476	$ 19,503	$ 50,734	$ 50,692
Net earnings per share – Basic:
Income from continuing operations - Net earnings per share - Basic (in USD per share)	$ 0.75	$ 0.61	$ 1.57	$ 1.59
Income from continuing operations - Net earnings per share - Diluted (in USD per share)	$ 0.75	$ 0.60	$ 1.55	$ 1.56
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	32,470	32,115	32,357	31,922
Weighted average shares outstanding, diluted (in shares)	32,770	32,571	32,677	32,524

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 24,476	$ 19,503	$ 50,734	$ 50,692
Other comprehensive (loss) income:
Foreign currency translation adjustment	(664)	139	1,176	(1,538)
Cumulative effect of accounting change	0	0	0	(350)
Minimum pension and post retirement benefit plan adjustments	12	27	36	80
Other comprehensive (loss) income	(652)	166	1,212	(1,808)
Total comprehensive income	$ 23,824	$ 19,669	$ 51,946	$ 48,884

- Definition

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

+ References + Details

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 137,618	$ 297,006
Accounts receivable, net	196,334	140,283
Inventories	83,048	98,913
Other current assets	17,527	8,351
Total current assets	434,527	544,553
Property, plant, and equipment, net	95,075	95,830
Operating lease assets	28,573
Goodwill	327,983	323,671
Acquired intangibles	96,185	96,375
Other assets	2,475	1,216
Total assets	984,818	1,061,645
Current liabilities:
Accounts payable	103,630	79,136
Accrued expenses	97,883	87,074
Billings in excess of cost	38,672	17,857
Current maturities of long-term debt	0	208,805
Total current liabilities	240,185	392,872
Long-term debt	0	1,600
Deferred income taxes	36,672	36,530
Non-current operating lease liabilities	20,461
Other non-current liabilities	30,287	33,950
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; 33,145 shares and 32,887 shares issued and outstanding in 2019 and 2018	332	329
Additional paid-in capital	293,009	282,525
Retained earnings	391,311	338,995
Accumulated other comprehensive loss	(6,022)	(7,234)
Cost of 888 and 796 common shares held in treasury in 2019 and 2018	(21,417)	(17,922)
Total shareholders’ equity	657,213	596,693
Total liabilities and shareholders' equity	$ 984,818	$ 1,061,645

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	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)	33,145,000	32,887,000
Treasury stock, shares (in shares)	888,000	796,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net income	$ 50,734	$ 50,692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,923	15,449
Stock compensation expense	10,087	6,854
Exit activity costs, non-cash	479	1,088
Benefit of deferred income taxes	(429)	0
Other, net	3,267	1,114
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(56,645)	(30,534)
Inventories	18,617	(16,263)
Other current assets and other assets	(6,949)	1,052
Accounts payable	22,770	9,237
Accrued expenses and other non-current liabilities	15,640	(479)
Net cash provided by operating activities	72,494	38,210
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(8,665)	(5,241)
Net proceeds from sale of property and equipment	87	3,147
Purchases of property, plant, and equipment	(7,703)	(6,767)
Net cash used in investing activities	(16,281)	(8,861)
Cash Flows from Financing Activities
Long-term debt payments	(212,000)	(400)
Payment of debt issuance costs	(1,235)	0
Purchase of treasury stock at market prices	(3,495)	(6,549)
Net proceeds from issuance of common stock	400	1,343
Net cash used in financing activities	(216,330)	(5,606)
Effect of exchange rate changes on cash	729	(610)
Net (decrease) increase in cash and cash equivalents	(159,388)	23,133
Cash and cash equivalents at beginning of year	297,006	222,280
Cash and cash equivalents at end of period	$ 137,618	$ 245,413

Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, shares at Dec. 31, 2017		32,332				615
Balance, value at Dec. 31, 2017	$ 531,719	$ 323	$ 271,957	$ 274,562	$ (4,366)	$ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,352			8,352
Foreign currency translation adjustment	110				110
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	27				27
Stock compensation expense	2,097		2,097
Stock options exercised, shares		13
Stock options exercised	226		226
Net settlement of restricted stock units, shares		53				24
Net settlement of restricted stock units	(850)	$ 1	(1)			$ (850)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
Balance, shares at Dec. 31, 2017		32,332				615
Balance, value at Dec. 31, 2017	531,719	$ 323	271,957	274,562	(4,366)	$ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,692
Foreign currency translation adjustment	(1,538)
Balance, shares at Sep. 30, 2018		32,842				778
Balance, value at Sep. 30, 2018	582,875	$ 328	280,149	325,878	(6,174)	$ (17,306)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,837			22,837
Foreign currency translation adjustment	(1,787)				(1,787)
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	26				26
Stock compensation expense	2,731		2,731
Stock options exercised, shares		21
Stock options exercised	300		300
Awards of common shares (in shares)		2
Net settlement of restricted stock units, shares		334				128
Net settlement of restricted stock units	(5,166)	$ 3	(3)			$ (5,166)
Balance, shares at Jun. 30, 2018		32,755				767
Balance, value at Jun. 30, 2018	560,896	$ 327	277,307	306,375	(6,340)	$ (16,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,503			19,503
Foreign currency translation adjustment	139				139
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	27				27
Stock compensation expense	2,026		2,026
Stock options exercised, shares		50
Stock options exercised	817	$ 1	816
Net settlement of restricted stock units, shares		37				11
Net settlement of restricted stock units	(533)					$ (533)
Balance, shares at Sep. 30, 2018		32,842				778
Balance, value at Sep. 30, 2018	582,875	$ 328	280,149	325,878	(6,174)	$ (17,306)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,345			6,345
Foreign currency translation adjustment	842				842
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	2,371		2,371
Stock options exercised, shares		12
Stock options exercised	139		139
Net settlement of restricted stock units, shares		127				59
Net settlement of restricted stock units	(2,151)	$ 1	(1)			$ (2,151)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,734
Foreign currency translation adjustment	1,176
Balance, shares at Sep. 30, 2019		33,145				888
Balance, value at Sep. 30, 2019	657,213	$ 332	293,009	391,311	(6,022)	$ (21,417)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,913			19,913
Foreign currency translation adjustment	998				998
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	3,720		3,720
Stock options exercised, shares		5
Stock options exercised	69		69
Awards of common shares (in shares)		8
Net settlement of restricted stock units, shares		62				25
Net settlement of restricted stock units	(998)	$ 1	(1)			$ (998)
Balance, shares at Jun. 30, 2019		33,101				880
Balance, value at Jun. 30, 2019	629,547	$ 331	288,822	366,835	(5,370)	$ (21,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,476			24,476
Foreign currency translation adjustment	(664)				(664)
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	3,996		3,996
Stock options exercised, shares		16
Stock options exercised	192		192
Net settlement of restricted stock units, shares		28				8
Net settlement of restricted stock units	(346)	$ 1	(1)			$ (346)
Balance, shares at Sep. 30, 2019		33,145				888
Balance, value at Sep. 30, 2019	$ 657,213	$ 332	$ 293,009	$ 391,311	$ (6,022)	$ (21,417)

Consolidated Statement of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Adjustment to pension benefit liability, taxes	$ 4	$ 5	$ 4	$ 10	$ 11	$ 10

Consolidated Financial Statements	9 Months Ended
Consolidated Financial Statements	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CONSOLIDATED FINANCIAL STATEMENTS	CONSOLIDATED FINANCIAL STATEMENTS The accompanying unaudited consolidated financial statements have been prepared by management in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments consisting of normal recurring adjustments considered necessary for the fair presentation of results for the interim period have been included. The Company's operations are seasonal; for this and other reasons, financial results for any interim period are not necessarily indicative of the results expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in our annual Form 10-K for the year ended December 31, 2018. The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

Recent Accounting Pronouncements (Notes)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

RECENT ACCOUNTING PRONOUNCEMENTS

Recent Accounting Pronouncements Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-02 Leases (Topic 842)	The standard requires lessees to recognize most leases as assets and liabilities on the balance sheet, but record expenses on the statement of operations in a manner similar to current accounting. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The standard also requires additional disclosures about leasing arrangements and requires a modified retrospective transition approach for existing leases, whereby the standard will be applied to the earliest year presented. The provisions of the standard are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted.	The Company has adopted this standard using the modified retrospective approach and elected the transition method to initially apply the new leases standard to all leases that exist at January 1, 2019. Under this transition method, the Company initially applied Topic 842 as of January 1, 2019, and recognized a cumulative-effect adjustment which increased the Company's beginning retained earnings as of January 1, 2019 by approximately $1.6 million. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new leases standard, which among other things, permitted the Company to carry forward its historical lease classification for leases in place prior to January 1, 2019. The comparative period information has not been restated and continues to be reported and presented under the accounting standards in effect for that period. The standard did not materially impact the Company's consolidated net earnings and had no impact on cash flows. Date of adoption: Q1 2019

Recent Accounting Pronouncements Not Yet 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 provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	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. Date of adoption: Q1 2020

Accounts Receivable, Net

9 Months Ended

Sep. 30, 2019

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

Accounts receivable consists of the following (in thousands):



	September 30, 2019			December 31, 2018
Trade accounts receivable	$	178,457		$	124,609
Costs in excess of billings	24,951			22,634
Total accounts receivables	203,408			147,243
Less allowance for doubtful accounts	(7,074		)	(6,960		)
Accounts receivable	$	196,334		$	140,283

Refer to Note 4 of the Company's consolidated financial statements included in this quarterly report on Form 10-Q for additional information concerning the Company's costs in excess of billings.

Revenue Revenue

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Sales 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; expanded and perforated metal; perimeter security solutions; expansion joints and structural bearings.

Revenue recognition

Revenue is recognized when, or as, the Company transfers control of promised products or services to a customer in an amount that reflects the consideration the Company expects to be entitled in exchange for transferring those products or services. Refer to Note 16 of this quarterly report on Form 10-Q for additional information related to revenue recognized by timing of transfer of control by reportable segment.

As of September 30, 2019, the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less.

Contract assets and contract liabilities

Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue. 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 sheet.

The following table presents the beginning and ending balances of costs in excess of billings, billings in excess of cost and unearned revenue as of September 30, 2019 and December 31, 2018, respectively, and revenue recognized during the nine months ended September 30, 2019 and 2018, respectively, that was in billings in excess of cost and unearned revenue at the beginning of the period (in thousands):



	September 30, 2019			December 31, 2018
Costs in excess of billings	$	24,951		$	22,634
Billings in excess of cost	(38,672		)	(17,857		)
Unearned revenue	(21,860		)	(12,028		)

The increase in contract liabilities as of September 30, 2019 compared with December 31, 2018 was primarily driven by the seasonality in our businesses.



	Nine Months Ended September 30, 2019		Nine Months Ended September 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	14,137	$	9,294
Amounts included in unearned revenue at the beginning of the period	$	11,052	$	2,977

Inventories

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following (in thousands):



	September 30, 2019		December 31, 2018
Raw material	$	48,158	$	57,845
Work-in-process	7,658		6,930
Finished goods	27,232		34,138
Total inventories	$	83,048	$	98,913

Acquisitions

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

ACQUISITIONS

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 preliminary 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 stock purchase agreement expected to be remitted in the next three to six months, at which time a final purchase price will be determined. The acquisition was financed through cash on hand.

The preliminary 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 $4.2 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 conservation markets.

The allocation of the preliminary 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	$	4,149
Working capital	(1,230		)
Property, plant and equipment	859
Acquired intangible assets	5,061
Other assets	508
Other liabilities	(982		)
Goodwill	4,185
Fair value of purchase consideration	$	12,550

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



	Fair Value		Weighted-Average Amortization Period
Trademarks	$	900	Indefinite
Technology	793		9 years
Customer relationships	3,368		9 years
Total	$	5,061

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. solar 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 solar 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 acquisition was financed through cash on hand.

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

The acquisition-related costs consisted of the following for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Selling, general and administrative costs	$	470	$	471	$	474	$	471
Cost of sales	134		—		134		—
Total acquisition-related costs	$	604	$	471	$	608	$	471

Goodwill and Related Intangible Assets

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND RELATED INTANGIBLE ASSETS

Goodwill

The changes in the carrying amount of goodwill for the nine months ended September 30, 2019 are as follows (in thousands):



	Renewable Energy & Conservation			Residential Products		Industrial and Infrastructure Products		Total
Balance at December 31, 2018	$	71,827		$	198,075	$	53,769	$	323,671
Acquired goodwill	4,185			—				4,185
Adjustments to prior year acquisitions	(172		)			—		(172		)
Foreign currency translation	137			—		162		299
Balance at September 30, 2019	$	75,977		$	198,075	$	53,931	$	327,983

Acquired Intangible Assets

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



	September 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Weighted-Average Amortization Period
Indefinite-lived intangible assets:
Trademarks	$	44,770	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,122		3,954		6,094		3,518		3 to 15 Years
Unpatented technology	29,444		15,301		28,644		13,881		5 to 20 Years
Customer relationships	74,072		39,187		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,430		1,649		1,224		4 to 10 Years
	111,287		59,872		106,806		54,301
Total acquired intangible assets	$	156,057	$	59,872	$	150,676	$	54,301

The following table summarizes the acquired intangible asset amortization expense for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Amortization expense	$	1,840	$	2,121	$	5,434	$	6,408

Amortization expense related to acquired intangible assets for the remainder of fiscal 2019 and the next five years thereafter is estimated as follows (in thousands):



	2019		2020		2021		2022		2023		2024
Amortization expense	$	1,798	$	6,904	$	6,709	$	6,231	$	5,693	$	5,437

Long-Term Debt	9 Months Ended
Long-Term Debt	Sep. 30, 2019
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT As of September 30, 2019, the Company did not have any long-term debt outstanding. At December 31, 2018, the Company's total outstanding debt was $210.4 million, which included $210.0 million of Senior Subordinated 6.25% Notes and $2.0 million of other debt, net of $1.6 million in unamortized debt issuance costs. $208.8 million of total debt at December 31, 2018 was included in current liabilities. Senior Credit Agreement On January 24, 2019, the Company entered into a Sixth Amended and Restated Credit Agreement ("2019 Senior Credit Agreement"), which amends and restates the Company’s Fifth Amended and Restated Credit Agreement dated December 9, 2015, and provides for a revolving credit facility and letters of credit in an aggregate amount equal to $400 million. The Company can request additional financing from the lenders 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 2019 Senior Credit Agreement contains three financial covenants. As of September 30, 2019, the Company is in compliance with all three covenants. Borrowings under the 2019 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 $6.0 million have been issued under the 2019 Senior Credit Agreement on behalf of the Company as of September 30, 2019. These letters of credit reduce the amount otherwise available under the revolving credit facility. As of September 30, 2019, the Company had $394.0 million of availability under the revolving credit facility. No borrowings were outstanding under the Company's revolving credit facility at September 30, 2019 and December 31, 2018. Senior Subordinated Notes On January 31, 2013, the Company issued $210 million of 6.25% Senior Subordinated Notes ("Notes") due February 1, 2021. On December 20, 2018, the Company announced its redemption of its $210 million outstanding Notes, effective February 1, 2019. The Notes were redeemed in accordance with the provisions of the indenture governing the Notes on February 1, 2019. The Company recorded a charge of $1.1 million for the write-off of deferred financing fees relating to the Notes during the nine months ended September 30, 2019.

Accumulated Other Comprehensive (Loss) Income

9 Months Ended

Sep. 30, 2019

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

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

The following tables summarize the cumulative balance of each component of accumulated other comprehensive loss, net of tax, for the three and nine months ended September 30, (in thousands):



	Foreign Currency Translation Adjustment			Minimum pension and 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 pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	(664		)	—			(664		)	—			(664		)
Balance at September 30, 2019	$	(4,763	)	$	(1,991	)	$	(6,754	)	$	(732	)	$	(6,022	)



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017	$	(2,698	)	$	(2,638	)	$	(5,336	)	$	(970	)	$	(4,366	)
Cumulative effect of accounting change	—			(350		)	(350		)	—			(350		)
Minimum pension and post retirement health care plan adjustments	—			37			37			10			27
Foreign currency translation adjustment	110			—			110			—			110
Balance at March 31, 2018	$	(2,588	)	$	(2,951	)	$	(5,539	)	$	(960	)	$	(4,579	)
Minimum pension and post retirement health care plan adjustments	—			37			37			11			26
Foreign currency translation adjustment	(1,787		)	—			(1,787		)	—			(1,787		)
Balance at June 30, 2018	$	(4,375	)	$	(2,914	)	$	(7,289	)	$	(949	)	$	(6,340	)
Minimum pension and post retirement health care plan adjustments	—			37			37			10			27
Foreign currency translation adjustment	139			—			139			—			139
Balance at September 30, 2018	$	(4,236	)	$	(2,877	)	$	(7,113	)	$	(939	)	$	(6,174	)

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

Equity-Based Compensation

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

EQUITY-BASED COMPENSATION

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"). 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.

Equity Based Awards - Settled in Stock

The following table sets forth the number of equity-based awards granted during the nine months ended September 30, which will convert to shares upon vesting, along with the weighted average grant date fair values:



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	183,908	$	40.49	135,540	$	33.60
Restricted stock units	144,172	$	39.43	95,674	$	36.81
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

(1) Included in the performance stock units granted above are 145,420 performance stock units awarded in the first quarter of 2019, which will convert to shares based on the Company's actual return on invested capital ("ROIC") relative to the ROIC targeted for the performance period ended December 31, 2019, and 38,488 performance stock units granted in the third quarter of 2019, which will convert to shares based on net sales and gross profit performance of Apeks acquired in August 2019 compared to targeted net sales and gross profit for the performance period ended December 31, 2021.

(2) Performance stock units granted in 2018 which will convert to 126,337 shares to be issued in the first quarter of 2021, representing 95.5% of the targeted 2018 award, based on the Company’s actual ROIC compared to ROIC target for the performance period ended December 31, 2018.

Equity Based Awards - Settled in Cash

The Company's equity-based liability includes awards under a management stock purchase plan. As of September 30, 2019, the Company's total share-based liabilities recorded on the consolidated balance sheet were $27.0 million, of which $22.0 million was included in non-current liabilities. The share-based liabilities as of December 31, 2018 were $38.4 million, of which $23.6 million was included in non-current liabilities.

During the nine months ended September 30, 2019, the Company paid $8.9 million to participants of cash-settled performance stock units awarded in 2016. The participants earned 200% of the target, or 256,000 units, which were converted to cash and valued at the trailing 90-day closing price of the Company's common stock as of December 31, 2018.

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 compensation.

The deferrals and company-matching 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 and the payments made with respect to restricted stock units issued under the MSPP during the nine months ended September 30,:



	2019		2018
Restricted stock units credited	51,381		74,180
Share-based liabilities paid (in thousands)	$	5,742	$	4,986

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

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 at September 30, 2019 and December 31, 2018. As of September 30, 2019, the Company does not have any financial instrument for which the carrying value differs from its fair value. At December 31, 2018, the Company's only financial instrument for which the carrying value differs from its fair value was the Company's Senior Subordinated 6.25% Notes, which were redeemed on February 1, 2019. At December 31, 2018, the fair value of the outstanding debt, net of unamortized debt issuance costs, was $210.8 million compared to its carrying value of $210.4 million.

- 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

Leases

9 Months Ended

Sep. 30, 2019

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. For leases with terms greater than twelve months, at lease commencement the Company recognizes a right-of-use asset and a lease liability. 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.

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 September 30, 2019, 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.



(In thousands)	Classification	September 30, 2019
Assets	Operating lease assets	$	28,573

Liabilities
Current	Accrued expenses	$	8,350
Non-current	Non-current operating lease liabilities	20,461
		$	28,811



Lease cost (in thousands)	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,102	$	9,649



Other information (in thousands)	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	8,635
Right-of-use assets obtained in exchange for new lease liabilities	$	5,974



Lease Term and Discount Rate	September 30, 2019
Weighted-average remaining lease term - operating leases	4.0		years
Weighted-average discount rate - operating leases	5.8	%



Maturity of lease liabilities	(In thousands)
2019 (October 1, 2019 through December 31, 2019)	$	2,680
2020	9,172
2021	7,526
2022	5,621
2023	4,902
After 2023	2,557
Total lease payments	32,458
Less: present value discount	(3,647		)
Present value of lease liabilities	$	28,811

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, the unrecognized deferred gain related to sale-leaseback transactions was recorded as a cumulative-effect adjustment to increase retained earnings, net of related income tax effects.

Exit Activity Costs and Asset Impairments

9 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

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, and in the sale and exiting of less profitable businesses or products lines.

Exit activity costs were incurred during the nine months ended September 30, 2019 which related to contract terminations, moving and closing costs, and severance incurred as a result of process simplification initiatives. One facility was closed during the nine months ended September 30, 2019.

During the nine months ended September 30, 2018, the Company incurred exit activity costs and asset impairment charges resulting from the above initiatives. In conjunction with these initiatives, the Company closed two facilities during the first nine months of 2018 and sold and leased back another facility which resulted in a gain, which was partially offset by inventory impairment charges incurred for discontinued products.

The following tables set forth the asset impairment charges and exit activity costs incurred by segment during the three and nine months ended September 30, related to the restructuring activities described above (in thousands):



	Three months ended September 30,
	2019							2018
	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 and Conservation	$	(9	)	$	46	$	37	$	—	$	(156	)	$	(156	)
Residential Products	478			2,937		3,415		1,392		485			1,877
Industrial and Infrastructure Products	10			275		285		358		1,417			1,775
Corporate	—			246		246		—		164			164
Total exit activity costs & asset impairments	$	479		$	3,504	$	3,983	$	1,750	$	1,910		$	3,660



	Nine months ended September 30,
	2019							2018
	Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity costs		Total		Inventory write-downs &/or asset impairment charges (recoveries), net			Exit activity (recoveries) costs, net			Total
Renewable Energy and Conservation	$	(9	)	$	45	$	36	$	84		$	(107	)	$	(23	)
Residential Products	478			3,307		3,785		1,349			333			1,682
Industrial and Infrastructure Products	10			1,588		1,598		(345		)	1,607			1,262
Corporate	—			919		919		—			431			431
Total exit activity costs & asset impairments	$	479		$	5,859	$	6,338	$	1,088		$	2,264		$	3,352

The following table provides a summary of where the asset impairments and exit activity costs (recoveries) were recorded in the consolidated statements of income for the three and nine months ended September 30, (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of sales	$	683	$	1,621	$	968	$	1,465
Selling, general, and administrative expense	3,300		2,039		5,370		1,887
Net asset impairment and exit activity charges	$	3,983	$	3,660	$	6,338	$	3,352

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	5,859			2,264
Cash payments	(3,032		)	(1,608		)
Balance at September 30	$	4,750		$	1,617

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three and nine months ended September 30, and the applicable effective tax rates:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,843		$	6,473		$	14,901		$	15,574
Effective tax rate	21.8		%	24.9		%	22.7		%	23.5		%

The effective tax rate for the three and nine months ended September 30, 2019 and 2018 respectively, was more than the U.S. federal statutory rate of 21% due to state taxes and nondeductible permanent differences partially offset by favorable discrete items.

Earnings per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic earnings and diluted weighted-average shares outstanding are as follows for the three and nine months ended September 30, (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	24,476	$	19,503	$	50,734	$	50,692
Denominator for basic earnings per share:
Weighted average shares outstanding	32,470		32,115		32,357		31,922
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,470		32,115		32,357		31,922
Common stock options and stock units	300		456		320		602
Weighted average shares and conversions	32,770		32,571		32,677		32,524

The weighted average number of diluted shares does not include potential anti-dilutive common shares issuable pursuant to equity based incentive compensation awards, aggregating to 346,000 and 247,000 for the three months ended September 30, 2019 and 2018, respectively, and 324,000 and 328,000 for the nine months ended September 30, 2019 and 2018, respectively.

Segment Information

9 Months Ended

Sep. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

SEGMENT INFORMATION

The Company is organized into three reportable segments on the basis of the production process and 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)	Industrial and Infrastructure Products, which primarily includes expanded and perforated metal, perimeter security systems, expansion joints, and structural bearings.

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 performance of the segments described above for the three and nine months ended September 30, (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Net sales:
Renewable Energy and Conservation	$	116,771		$	98,486		$	261,612		$	229,187
Residential Products	$	126,275		$	125,839		$	360,417		$	360,915
Industrial and Infrastructure Products	56,361			56,033			168,096			172,218
Less: Intersegment sales	(171		)	(272		)	(817		)	(861		)
Net Industrial and Infrastructure Products	56,190			55,761			167,279			171,357
Total consolidated net sales	$	299,236		$	280,086		$	789,308		$	761,459

Income from operations:
Renewable Energy and Conservation	$	19,633		$	15,072		$	30,914		$	28,690
Residential Products	17,012			20,138			49,880			57,572
Industrial and Infrastructure Products	5,462			2,892			13,660			12,098
Unallocated Corporate Expenses	(10,687		)	(8,698		)	(25,862		)	(22,839		)
Total consolidated income from operations	$	31,420		$	29,404		$	68,592		$	75,521

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30, 2019
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	12,682	$	125,350	$	46,781	$	184,813
Over Time	104,089		925		9,409		114,423
Total net sales	$	116,771	$	126,275	$	56,190	$	299,236



	Three Months Ended September 30, 2018
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	10,784	$	125,118	$	47,686	$	183,588
Over Time	87,702		721		8,075		96,498
Total net sales	$	98,486	$	125,839	$	55,761	$	280,086



	Nine Months Ended September 30, 2019
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	28,441	$	357,808	$	138,383	$	524,632
Over Time	233,171		2,609		28,896		264,676
Total net sales	$	261,612	$	360,417	$	167,279	$	789,308



	Nine Months Ended September 30, 2018
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	25,128	$	358,960	$	145,657	$	529,745
Over Time	204,059		1,955		25,700		231,714
Total net sales	$	229,187	$	360,915	$	171,357	$	761,459

Recent Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-02 Leases (Topic 842)	The standard requires lessees to recognize most leases as assets and liabilities on the balance sheet, but record expenses on the statement of operations in a manner similar to current accounting. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The standard also requires additional disclosures about leasing arrangements and requires a modified retrospective transition approach for existing leases, whereby the standard will be applied to the earliest year presented. The provisions of the standard are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted.	The Company has adopted this standard using the modified retrospective approach and elected the transition method to initially apply the new leases standard to all leases that exist at January 1, 2019. Under this transition method, the Company initially applied Topic 842 as of January 1, 2019, and recognized a cumulative-effect adjustment which increased the Company's beginning retained earnings as of January 1, 2019 by approximately $1.6 million. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new leases standard, which among other things, permitted the Company to carry forward its historical lease classification for leases in place prior to January 1, 2019. The comparative period information has not been restated and continues to be reported and presented under the accounting standards in effect for that period. The standard did not materially impact the Company's consolidated net earnings and had no impact on cash flows. Date of adoption: Q1 2019

Recent Accounting Pronouncements Not Yet 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 provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	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. Date of adoption: Q1 2020

Recent Accounting Pronouncements - (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

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. 2016-02 Leases (Topic 842)	The standard requires lessees to recognize most leases as assets and liabilities on the balance sheet, but record expenses on the statement of operations in a manner similar to current accounting. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The standard also requires additional disclosures about leasing arrangements and requires a modified retrospective transition approach for existing leases, whereby the standard will be applied to the earliest year presented. The provisions of the standard are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted.	The Company has adopted this standard using the modified retrospective approach and elected the transition method to initially apply the new leases standard to all leases that exist at January 1, 2019. Under this transition method, the Company initially applied Topic 842 as of January 1, 2019, and recognized a cumulative-effect adjustment which increased the Company's beginning retained earnings as of January 1, 2019 by approximately $1.6 million. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new leases standard, which among other things, permitted the Company to carry forward its historical lease classification for leases in place prior to January 1, 2019. The comparative period information has not been restated and continues to be reported and presented under the accounting standards in effect for that period. The standard did not materially impact the Company's consolidated net earnings and had no impact on cash flows. Date of adoption: Q1 2019

Recent Accounting Pronouncements Not Yet 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 provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	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. Date of adoption: Q1 2020

Accounts Receivable, Net (Tables)

9 Months Ended

Sep. 30, 2019

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):



	September 30, 2019			December 31, 2018
Trade accounts receivable	$	178,457		$	124,609
Costs in excess of billings	24,951			22,634
Total accounts receivables	203,408			147,243
Less allowance for doubtful accounts	(7,074		)	(6,960		)
Accounts receivable	$	196,334		$	140,283

Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability



	September 30, 2019			December 31, 2018
Costs in excess of billings	$	24,951		$	22,634
Billings in excess of cost	(38,672		)	(17,857		)
Unearned revenue	(21,860		)	(12,028		)

The increase in contract liabilities as of September 30, 2019 compared with December 31, 2018 was primarily driven by the seasonality in our businesses.



	Nine Months Ended September 30, 2019		Nine Months Ended September 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	14,137	$	9,294
Amounts included in unearned revenue at the beginning of the period	$	11,052	$	2,977

Inventories (Tables)

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Schedule Of Inventories

Inventories consist of the following (in thousands):



	September 30, 2019		December 31, 2018
Raw material	$	48,158	$	57,845
Work-in-process	7,658		6,930
Finished goods	27,232		34,138
Total inventories	$	83,048	$	98,913

Acquisitions (Tables)

9 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Business Combinations [Abstract]

Allocation Of Purchase Consideration To The Assets Acquired And Liabilities Assumed

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 allocation of the preliminary 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	$	4,149
Working capital	(1,230		)
Property, plant and equipment	859
Acquired intangible assets	5,061
Other assets	508
Other liabilities	(982		)
Goodwill	4,185
Fair value of purchase consideration	$	12,550

Intangible Assets Acquired

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



	Fair Value		Weighted-Average Amortization Period
Trademarks	$	900	Indefinite
Technology	793		9 years
Customer relationships	3,368		9 years
Total	$	5,061

Schedule of Acquisitions Related Costs

The acquisition-related costs consisted of the following for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Selling, general and administrative costs	$	470	$	471	$	474	$	471
Cost of sales	134		—		134		—
Total acquisition-related costs	$	604	$	471	$	608	$	471

Goodwill and Related Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Changes In Carrying Amount Of Goodwill

The changes in the carrying amount of goodwill for the nine months ended September 30, 2019 are as follows (in thousands):



	Renewable Energy & Conservation			Residential Products		Industrial and Infrastructure Products		Total
Balance at December 31, 2018	$	71,827		$	198,075	$	53,769	$	323,671
Acquired goodwill	4,185			—				4,185
Adjustments to prior year acquisitions	(172		)			—		(172		)
Foreign currency translation	137			—		162		299
Balance at September 30, 2019	$	75,977		$	198,075	$	53,931	$	327,983

Schedule Of Acquired Intangible Assets

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



	September 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Weighted-Average Amortization Period
Indefinite-lived intangible assets:
Trademarks	$	44,770	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,122		3,954		6,094		3,518		3 to 15 Years
Unpatented technology	29,444		15,301		28,644		13,881		5 to 20 Years
Customer relationships	74,072		39,187		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,430		1,649		1,224		4 to 10 Years
	111,287		59,872		106,806		54,301
Total acquired intangible assets	$	156,057	$	59,872	$	150,676	$	54,301

Schedule of Acquired Intangible Asset Amortization Expense

The following table summarizes the acquired intangible asset amortization expense for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Amortization expense	$	1,840	$	2,121	$	5,434	$	6,408

Schedule Of Amortization Expense

Amortization expense related to acquired intangible assets for the remainder of fiscal 2019 and the next five years thereafter is estimated as follows (in thousands):



	2019		2020		2021		2022		2023		2024
Amortization expense	$	1,798	$	6,904	$	6,709	$	6,231	$	5,693	$	5,437

Accumulated Other Comprehensive (Loss) Income (Tables)

9 Months Ended

Sep. 30, 2019

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

Schedule Of Components Of Accumulated Other Comprehensive Loss

The following tables summarize the cumulative balance of each component of accumulated other comprehensive loss, net of tax, for the three and nine months ended September 30, (in thousands):



	Foreign Currency Translation Adjustment			Minimum pension and 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 pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	(664		)	—			(664		)	—			(664		)
Balance at September 30, 2019	$	(4,763	)	$	(1,991	)	$	(6,754	)	$	(732	)	$	(6,022	)



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017	$	(2,698	)	$	(2,638	)	$	(5,336	)	$	(970	)	$	(4,366	)
Cumulative effect of accounting change	—			(350		)	(350		)	—			(350		)
Minimum pension and post retirement health care plan adjustments	—			37			37			10			27
Foreign currency translation adjustment	110			—			110			—			110
Balance at March 31, 2018	$	(2,588	)	$	(2,951	)	$	(5,539	)	$	(960	)	$	(4,579	)
Minimum pension and post retirement health care plan adjustments	—			37			37			11			26
Foreign currency translation adjustment	(1,787		)	—			(1,787		)	—			(1,787		)
Balance at June 30, 2018	$	(4,375	)	$	(2,914	)	$	(7,289	)	$	(949	)	$	(6,340	)
Minimum pension and post retirement health care plan adjustments	—			37			37			10			27
Foreign currency translation adjustment	139			—			139			—			139
Balance at September 30, 2018	$	(4,236	)	$	(2,877	)	$	(7,113	)	$	(939	)	$	(6,174	)

Equity-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule Of Number Of Awards And Weighted Average Grant Date Fair Value



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	183,908	$	40.49	135,540	$	33.60
Restricted stock units	144,172	$	39.43	95,674	$	36.81
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

Management Stock Purchase Plan



	2019		2018
Restricted stock units credited	51,381		74,180
Share-based liabilities paid (in thousands)	$	5,742	$	4,986

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Assets And Liabilities, Lessee



(In thousands)	Classification	September 30, 2019
Assets	Operating lease assets	$	28,573

Liabilities
Current	Accrued expenses	$	8,350
Non-current	Non-current operating lease liabilities	20,461
		$	28,811

Lease, Cost



Lease cost (in thousands)	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,102	$	9,649



Other information (in thousands)	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	8,635
Right-of-use assets obtained in exchange for new lease liabilities	$	5,974



Lease Term and Discount Rate	September 30, 2019
Weighted-average remaining lease term - operating leases	4.0		years
Weighted-average discount rate - operating leases	5.8	%

Lessee, Operating Lease, Liability, Maturity



Maturity of lease liabilities	(In thousands)
2019 (October 1, 2019 through December 31, 2019)	$	2,680
2020	9,172
2021	7,526
2022	5,621
2023	4,902
After 2023	2,557
Total lease payments	32,458
Less: present value discount	(3,647		)
Present value of lease liabilities	$	28,811

Exit Activity Costs and Asset Impairments (Tables)

9 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Summary Of Exit Activity Costs And Asset Impairments



	Three months ended September 30,
	2019							2018
	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 and Conservation	$	(9	)	$	46	$	37	$	—	$	(156	)	$	(156	)
Residential Products	478			2,937		3,415		1,392		485			1,877
Industrial and Infrastructure Products	10			275		285		358		1,417			1,775
Corporate	—			246		246		—		164			164
Total exit activity costs & asset impairments	$	479		$	3,504	$	3,983	$	1,750	$	1,910		$	3,660



	Nine months ended September 30,
	2019							2018
	Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity costs		Total		Inventory write-downs &/or asset impairment charges (recoveries), net			Exit activity (recoveries) costs, net			Total
Renewable Energy and Conservation	$	(9	)	$	45	$	36	$	84		$	(107	)	$	(23	)
Residential Products	478			3,307		3,785		1,349			333			1,682
Industrial and Infrastructure Products	10			1,588		1,598		(345		)	1,607			1,262
Corporate	—			919		919		—			431			431
Total exit activity costs & asset impairments	$	479		$	5,859	$	6,338	$	1,088		$	2,264		$	3,352



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of sales	$	683	$	1,621	$	968	$	1,465
Selling, general, and administrative expense	3,300		2,039		5,370		1,887
Net asset impairment and exit activity charges	$	3,983	$	3,660	$	6,338	$	3,352

Reconciliation Of Liability For Exit Activity Costs Relating To Facility Consolidation Efforts

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	5,859			2,264
Cash payments	(3,032		)	(1,608		)
Balance at September 30	$	4,750		$	1,617

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Summary Of Provision For Income Taxes For Continuing Operations

The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three and nine months ended September 30, and the applicable effective tax rates:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,843		$	6,473		$	14,901		$	15,574
Effective tax rate	21.8		%	24.9		%	22.7		%	23.5		%

Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule Of Computation Of Basic And Diluted Loss Per Share

Basic earnings and diluted weighted-average shares outstanding are as follows for the three and nine months ended September 30, (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	24,476	$	19,503	$	50,734	$	50,692
Denominator for basic earnings per share:
Weighted average shares outstanding	32,470		32,115		32,357		31,922
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,470		32,115		32,357		31,922
Common stock options and stock units	300		456		320		602
Weighted average shares and conversions	32,770		32,571		32,677		32,524

Segment Information (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Reconciliation Of Sales To Earnings Before Income Taxes by Segment

The following table illustrates certain measurements used by management to assess performance of the segments described above for the three and nine months ended September 30, (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Net sales:
Renewable Energy and Conservation	$	116,771		$	98,486		$	261,612		$	229,187
Residential Products	$	126,275		$	125,839		$	360,417		$	360,915
Industrial and Infrastructure Products	56,361			56,033			168,096			172,218
Less: Intersegment sales	(171		)	(272		)	(817		)	(861		)
Net Industrial and Infrastructure Products	56,190			55,761			167,279			171,357
Total consolidated net sales	$	299,236		$	280,086		$	789,308		$	761,459

Income from operations:
Renewable Energy and Conservation	$	19,633		$	15,072		$	30,914		$	28,690
Residential Products	17,012			20,138			49,880			57,572
Industrial and Infrastructure Products	5,462			2,892			13,660			12,098
Unallocated Corporate Expenses	(10,687		)	(8,698		)	(25,862		)	(22,839		)
Total consolidated income from operations	$	31,420		$	29,404		$	68,592		$	75,521

Disaggregation of Revenue

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three and nine months ended September 30 (in thousands):



	Three Months Ended September 30, 2019
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	12,682	$	125,350	$	46,781	$	184,813
Over Time	104,089		925		9,409		114,423
Total net sales	$	116,771	$	126,275	$	56,190	$	299,236



	Three Months Ended September 30, 2018
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	10,784	$	125,118	$	47,686	$	183,588
Over Time	87,702		721		8,075		96,498
Total net sales	$	98,486	$	125,839	$	55,761	$	280,086



	Nine Months Ended September 30, 2019
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	28,441	$	357,808	$	138,383	$	524,632
Over Time	233,171		2,609		28,896		264,676
Total net sales	$	261,612	$	360,417	$	167,279	$	789,308



	Nine Months Ended September 30, 2018
	Renewable Energy and Conservation		Residential Products		Industrial and Infrastructure Products		Total
Net sales:
Point in Time	$	25,128	$	358,960	$	145,657	$	529,745
Over Time	204,059		1,955		25,700		231,714
Total net sales	$	229,187	$	360,915	$	171,357	$	761,459

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 391,311		$ 338,995
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 1,600

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade accounts receivable	$ 178,457	$ 124,609
Costs in excess of billings	24,951	22,634
Total accounts receivables	203,408	147,243
Less allowance for doubtful accounts	(7,074)	(6,960)
Accounts receivable	$ 196,334	$ 140,283

Revenue - Narrative (Details)	Sep. 30, 2019
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation expected timing of satisfaction	1 year

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Costs in excess of billings	$ 24,951		$ 22,634
Amounts included in billings in excess of cost at the beginning of the period	14,137	$ 9,294
Amounts included in unearned revenue at the beginning of the period	11,052	$ 2,977
Billings in excess of cost
Capitalized Contract Cost [Line Items]
Contract with customer liability	(38,672)		(17,857)
Unearned revenue
Capitalized Contract Cost [Line Items]
Contract with customer liability	$ (21,860)		$ (12,028)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw material	$ 48,158	$ 57,845
Work-in-process	7,658	6,930
Finished goods	27,232	34,138
Total inventories	$ 83,048	$ 98,913

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Aug. 30, 2019	Aug. 21, 2018	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill			$ 327,983	$ 323,671
Apeks
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 12,600
Goodwill	$ 4,185
SolarBOS
Business Acquisition [Line Items]
Aggregate consideration for acquisition		$ 6,400
Goodwill		$ 2,879
Maximum \| Apeks
Business Acquisition [Line Items]
Working capital adjustment period	6 months
Minimum \| Apeks
Business Acquisition [Line Items]
Working capital adjustment period	3 months

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Aug. 30, 2019	Dec. 31, 2018	Aug. 21, 2018
Business Acquisition [Line Items]
Goodwill	$ 327,983		$ 323,671
Apeks
Business Acquisition [Line Items]
Cash		$ 4,149
Working capital		(1,230)
Property, plant and equipment		859
Acquired intangible assets		5,061
Other assets		508
Other liabilities		(982)
Goodwill		4,185
Fair value of purchase consideration		$ 12,550
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	Aug. 30, 2019	Aug. 21, 2018
Apeks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 5,061
Apeks \| Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value , indefinite-lived intangible assets acquired	900
Apeks \| Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 793
Estimated Useful Life	9 years
Apeks \| Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,368
Estimated Useful Life	9 years
SolarBOS
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 1,450
SolarBOS \| Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 300
Estimated Useful Life		3 years
SolarBOS \| Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 450
Estimated Useful Life		9 years
SolarBOS \| Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 700
Estimated Useful Life		9 years

Acquisitions (Schedule of Acquisitions Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Acquisition related costs	$ 604	$ 471	$ 608	$ 471
Selling, general and administrative costs
Business Acquisition [Line Items]
Acquisition related costs	470	471	474	471
Cost of sales
Business Acquisition [Line Items]
Acquisition related costs	$ 134	$ 0	$ 134	$ 0

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2018	$ 323,671
Acquired goodwill	4,185
Adjustments to prior year acquisitions	(172)
Foreign currency translation	299
Balance at September 30, 2019	327,983
Renewable Energy and Conservation
Goodwill [Roll Forward]
Balance at December 31, 2018	71,827
Acquired goodwill	4,185
Adjustments to prior year acquisitions	(172)
Foreign currency translation	137
Balance at September 30, 2019	75,977
Residential Products
Goodwill [Roll Forward]
Balance at December 31, 2018	198,075
Acquired goodwill	0
Foreign currency translation	0
Balance at September 30, 2019	198,075
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at December 31, 2018	53,769
Adjustments to prior year acquisitions	0
Foreign currency translation	162
Balance at September 30, 2019	$ 53,931

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 111,287	$ 106,806
Total acquired intangible assets, Gross Carrying Amount	156,057	150,676
Accumulated Amortization, Finite-lived intangible assets	59,872	54,301
Total acquired intangible assets, Accumulated Amortization	59,872	54,301
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	6,122	6,094
Accumulated Amortization, Finite-lived intangible assets	3,954	3,518
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	29,444	28,644
Accumulated Amortization, Finite-lived intangible assets	15,301	13,881
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	74,072	70,419
Accumulated Amortization, Finite-lived intangible assets	39,187	35,678
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,649	1,649
Accumulated Amortization, Finite-lived intangible assets	1,430	1,224
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	44,770	43,870
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0
Minimum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	3 years
Minimum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	4 years
Maximum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	15 years
Maximum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	20 years
Maximum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	17 years
Maximum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	10 years

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,840	$ 2,121	$ 5,434	$ 6,408
2019	1,798		1,798
2020	6,904		6,904
2021	6,709		6,709
2022	6,231		6,231
2023	5,693		5,693
2024	$ 5,437		$ 5,437

Long-Term Debt (Narrative) (Details)	9 Months Ended
Long-Term Debt (Narrative) (Details)	Sep. 30, 2019 USD ($) covenant	Jan. 24, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2013	Jan. 31, 2013 USD ($)
Debt Instrument [Line Items]
Carrying value of outstanding debt	$ 0		$ 210,400,000
Unamortized debt issuance costs			1,600,000
Current maturities of long-term debt	0		208,805,000
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, issued value			$ 210,000,000.0
Senior Subordinated Notes, interest rate			6.25%
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Carrying value of outstanding debt			$ 2,000,000.0
Senior Subordinated 6.25% Notes
Debt Instrument [Line Items]
Carrying value of outstanding debt			$ 210,000,000
Debt instrument, issued value					$ 210,000,000
Senior Subordinated Notes, interest rate			6.25%	6.25%
Write off of deferred debt issuance cost	1,100,000
Revolving Credit Facility \| Senior Credit Agreement
Debt Instrument [Line Items]
Revolving credit facility, availability amount	394,000,000.0
Borrowings outstanding	0		$ 0
Standby Letters of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Letters of credit issued	$ 6,000,000.0
Line of Credit \| 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Current borrowing capacity		$ 400,000,000
Letters of credit issued		700,000,000
Number of debt covenants \| covenant	3
Medium-term Notes \| 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Debt instrument, issued value		$ 300,000,000

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (6,106)	$ (7,121)	$ (7,979)	$ (7,289)	$ (5,539)	$ (5,336)	$ (7,979)	$ (5,336)
Accumulated other comprehensive income, tax, beginning balance	(736)	(741)	(745)	(949)	(960)	(970)	(745)	(970)
Accumulated Other Comprehensive Income Beginning Balance	(5,370)	(6,380)	(7,234)	(6,340)	(4,579)	(4,366)	(7,234)	(4,366)
Cumulative effect of new accounting principle in period of adoption									$ 1,582	$ 274
Other comprehensive income (loss), net of tax	(652)			166			1,212	(1,808)
AOCI before tax, ending balance	(6,754)	(6,106)	(7,121)	(7,113)	(7,289)	(5,539)	(6,754)	(7,113)
Accumulated other comprehensive income, tax, ending balance	(732)	(736)	(741)	(939)	(949)	(960)	(732)	(939)
Accumulated Other Comprehensive Income Ending Balance	(6,022)	(5,370)	(6,380)	(6,174)	(6,340)	(4,579)	(6,022)	(6,174)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(4,099)	(5,097)	(5,939)	(4,375)	(2,588)	(2,698)	(5,939)	(2,698)
Other comprehensive income adjustments	(664)	998	842	139	(1,787)	110
Other comprehensive income (loss), net of tax	(664)	998	842	139	(1,787)	110
AOCI before tax, ending balance	(4,763)	(4,099)	(5,097)	(4,236)	(4,375)	(2,588)	(4,763)	(4,236)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	16	17	16	37	37	37
Other comprehensive income (loss), tax	4	5	4	10	11	10
Other comprehensive income (loss), net of tax	12	12	12	27	26	27
Minimum pension and post retirement benefit plan adjustments \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,007)	(2,024)	(2,040)	(2,914)	(2,951)	(2,638)	(2,040)	(2,638)
Other comprehensive income adjustments	16	17	16	37	37	37
AOCI before tax, ending balance	$ (1,991)	$ (2,007)	$ (2,024)	$ (2,877)	$ (2,914)	$ (2,951)	$ (1,991)	$ (2,877)
Accounting Standards Update 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption										(350)
Accounting Standards Update 2018-02 \| Minimum pension and post retirement benefit plan adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption										$ (350)

Equity-Based Compensation - Incentive Plan (Details)	May 04, 2018 shares
2018 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,000,000

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares		1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2021	Feb. 28, 2017	Mar. 31, 2021	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)				183,908	135,540
Weighted average grant date fair value (in USD per share)				$ 40.49	$ 33.60
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)				144,172	95,674
Weighted average grant date fair value (in USD per share)				$ 39.43	$ 36.81
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)				7,509	10,255
Weighted average grant date fair value (in USD per share)				$ 37.95	$ 35.96
Common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)				7,509	2,113
Weighted average grant date fair value (in USD per share)				$ 37.95	$ 35.50
Scenario, Forecast \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion (in shares)	38,488					145,420
2015 Incentive Plan \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion as percentage of total award		95.50%
2015 Incentive Plan \| Scenario, Forecast \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion (in shares)			126,337

Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 27.0	$ 38.4
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target performance stock units earned	200.00%
Units converted (in shares)	256,000
Closing period	90 days
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 22.0	$ 23.6
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs compensation expense	$ 8.9

Equity-Based Compensation (Management Stock Purchase Plan) (Details) - Management Stock Purchase Plan - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based liabilities paid (in thousands)	$ 5,742,000	$ 4,986,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average company stock price measurement period	200 days
Restricted stock units credited (in shares)	$ 51,381	$ 74,180

Fair Value Measurements (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018	Mar. 31, 2013
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of outstanding debt		$ 210,800,000
Carrying value of outstanding debt	$ 0	$ 210,400,000
Senior Subordinated 6.25% Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Senior Subordinated Notes, interest rate		6.25%	6.25%
Carrying value of outstanding debt		$ 210,000,000

Leases - Narrative (Details)	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	15 years

Leases - Assets and Liabilities of Lessee (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease assets	$ 28,573
Accrued expenses	8,350
Non-current operating lease liabilities	20,461
Total operating lease liability	$ 28,811

Leases - Schedule of Lease Cost and Assumptions (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 3,102	$ 9,649
Cash paid for amounts included in the measurement of operating liabilities		8,635
Right-of-use assets obtained in exchange for new lease liabilities		$ 5,974
Weighted-average remaining lease term - operating leases	4 years	4 years
Weighted-average discount rate - operating leases	5.80%	5.80%

Leases - Maturity of Lease Payments (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019 (October 1, 2019 through December 31, 2019)	$ 2,680
2020	9,172
2021	7,526
2022	5,621
2023	4,902
After 2023	2,557
Total lease payments	32,458
Less: present value discount	(3,647)
Present value of lease liabilities	$ 28,811

Exit Activity Costs and Asset Impairments (Narrative) (Details) - facility	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Number of facilities closed	1	2

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment (recoveries) charges, net	$ 479	$ 1,750	$ 479	$ 1,088
Exit activity costs	3,504	1,910	5,859	2,264
Total exit activity costs & asset impairments	3,983	3,660	6,338	3,352
Renewable Energy and Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment (recoveries) charges, net	(9)	0	(9)	84
Exit activity costs	46	(156)	45	(107)
Total exit activity costs & asset impairments	37	(156)	36	(23)
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment (recoveries) charges, net	478	1,392	478	1,349
Exit activity costs	2,937	485	3,307	333
Total exit activity costs & asset impairments	3,415	1,877	3,785	1,682
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment (recoveries) charges, net	10	358	10	(345)
Exit activity costs	275	1,417	1,588	1,607
Total exit activity costs & asset impairments	285	1,775	1,598	1,262
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment (recoveries) charges, net	0	0	0	0
Exit activity costs	246	164	919	431
Total exit activity costs & asset impairments	$ 246	$ 164	$ 919	$ 431

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 3,983	$ 3,660	$ 6,338	$ 3,352
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	683	1,621	968	1,465
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 3,300	$ 2,039	$ 5,370	$ 1,887

Exit Activity Costs and Asset Impairments (Reconciles of Liability for Exit Activity Costs Relating to Facility Consolidation Efforts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance			$ 1,923	$ 961
Exit activity costs	$ 3,504	$ 1,910	5,859	2,264
Cash payments			(3,032)	(1,608)
Ending balance	$ 4,750	$ 1,617	$ 4,750	$ 1,617

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 6,843	$ 6,473	$ 14,901	$ 15,574
Effective tax rate	21.80%	24.90%	22.70%	23.50%

Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
Earnings per Share (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 24,476	$ 19,913	$ 6,345	$ 19,503	$ 22,837	$ 8,352	$ 50,734	$ 50,692
Weighted average basic shares outstanding (in shares)	32,470,000			32,115,000			32,357,000	31,922,000
Common stock options and restricted stock (in shares)	300,000			456,000			320,000	602,000
Weighted average shares outstanding, diluted (in shares)	32,770,000			32,571,000			32,677,000	32,524,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	346,000			247,000			324,000	328,000

- Definition

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

+ References + Details

Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
Segment Information (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments \| segment			3
Net Sales	$ 299,236	$ 280,086	$ 789,308	$ 761,459
Total consolidated income from operations	31,420	29,404	68,592	75,521
Renewable Energy and Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	116,771	98,486	261,612	229,187
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	126,275	125,839	360,417	360,915
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	56,190	55,761	167,279	171,357
Operating Segments \| Renewable Energy and Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	116,771	98,486	261,612	229,187
Total consolidated income from operations	19,633	15,072	30,914	28,690
Operating Segments \| Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	126,275	125,839	360,417	360,915
Total consolidated income from operations	17,012	20,138	49,880	57,572
Operating Segments \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	56,361	56,033	168,096	172,218
Total consolidated income from operations	5,462	2,892	13,660	12,098
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	(171)	(272)	(817)	(861)
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Unallocated Corporate Expenses	$ (10,687)	$ (8,698)	$ (25,862)	$ (22,839)

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 299,236	$ 280,086	$ 789,308	$ 761,459
Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	116,771	98,486	261,612	229,187
Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	126,275	125,839	360,417	360,915
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	56,190	55,761	167,279	171,357
Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	184,813	183,588	524,632	529,745
Point in Time \| Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	12,682	10,784	28,441	25,128
Point in Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	125,350	125,118	357,808	358,960
Point in Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	46,781	47,686	138,383	145,657
Over Time
Disaggregation of Revenue [Line Items]
Net Sales	114,423	96,498	264,676	231,714
Over Time \| Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	104,089	87,702	233,171	204,059
Over Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	925	721	2,609	1,955
Over Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	$ 9,409	$ 8,075	$ 28,896	$ 25,700

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (350,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,582,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 624,000