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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 03, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	ROCK
Entity Registrant Name	GIBRALTAR INDUSTRIES, INC.
Entity Central Index Key	0000912562
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		31,760,071

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales:	$ 215,337	$ 206,605
Net Sales	215,337	206,605
Cost of sales	167,019	157,350
Gross profit	48,318	49,255
Selling, general, and administrative expense	34,475	39,576
Income from operations	13,843	9,679
Interest expense	3,269	3,576
Other (income) expense	(585)	54
Income before taxes	11,159	6,049
Provision for income taxes	2,807	2,053
Income from continuing operations	8,352	3,996
Discontinued operations:
Net income	$ 8,352	$ 3,996
Net earnings per share:
Net earnings per share - Basic (in USD per share)	$ 0.26	$ 0.13
Net earnings per share - Diluted
Net earnings per share - Diluted (in USD per share)	$ 0.26	$ 0.12
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	31,786	31,688
Weighted average shares outstanding, diluted (in shares)	32,444	32,254

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 8,352	$ 3,996
Other comprehensive income (loss):
Foreign currency translation adjustment	110	679
Cumulative effect of accounting change	(350)	0
Adjustment to retirement benefit liability, net of tax	(5)	(3)
Adjustment to post employment health care benefit liability, net of tax	32	29
Other comprehensive income (loss)	(213)	705
Total comprehensive income	$ 8,139	$ 4,701

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 200,741	$ 222,280
Accounts receivable, net	145,182	145,385
Inventories	90,236	86,372
Other current assets	6,712	8,727
Total current assets	442,871	462,764
Property, plant, and equipment, net	93,671	97,098
Goodwill	321,772	321,074
Acquired intangibles	104,059	105,768
Other assets	4,770	4,681
Total assets	967,143	991,385
Current liabilities:
Accounts payable	80,691	82,387
Accrued expenses	53,254	75,467
Billings in excess of cost	11,572	12,779
Current maturities of long-term debt	400	400
Total current liabilities	145,917	171,033
Long-term debt	209,817	209,621
Deferred income taxes	31,339	31,237
Other non-current liabilities	38,115	47,775
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; 32,398 shares and 32,332 shares issued and outstanding in 2018 and 2017	324	323
Additional paid-in capital	274,279	271,957
Retained earnings	283,538	274,562
Accumulated other comprehensive loss	(4,579)	(4,366)
Cost of 639 and 615 common shares held in treasury in 2018 and 2017	(11,607)	(10,757)
Total shareholders’ equity	541,955	531,719
Total liabilities and shareholders' equity	$ 967,143	$ 991,385

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	32,398,000	32,332,000
Treasury stock, shares	639,000	615,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net income	$ 8,352	$ 3,996
Income from continuing operations	8,352	3,996
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,189	5,480
Stock compensation expense	2,097	1,635
Net (gain) loss on sale of assets	(7)	12
Exit activity recoveries, non-cash	(727)	(917)
Other, net	360	240
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	4,947	(4,462)
Inventories	(8,907)	2,338
Other current assets and other assets	1,498	410
Accounts payable	(1,694)	5,672
Accrued expenses and other non-current liabilities	(33,314)	(12,061)
Net cash (used in) provided by operating activities of continuing operations	(22,206)	2,343
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired	0	(18,561)
Net proceeds from sale of property and equipment	2,823	9,233
Purchases of property, plant, and equipment	(1,033)	(1,453)
Net cash provided by (used in) investing activities	1,790	(10,781)
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(850)	(922)
Net proceeds from issuance of common stock	226	11
Net cash used in financing activities	(624)	(911)
Effect of exchange rate changes on cash	(499)	73
Net decrease in cash and cash equivalents	(21,539)	$ (9,276)
Cash and cash equivalents at beginning of year	222,280
Cash and cash equivalents at end of period	$ 200,741

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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle in period of adoption	$ 274		$ 0	$ 624
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
Foreign currency translation adjustment	110				110
Adjustment to retirement benefit liability, net of taxes of $(2)	(5)				(5)
Adjustment to post employment health care benefit liability, net of taxes of $12	32				32
Stock compensation expense	2,097		2,097
Stock options exercised, shares		13
Stock options exercised	226	$ 0	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					$ (350)

Consolidated Statement of Shareholders' Equity (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Statement of Stockholders' Equity [Abstract]
Adjustment to pension benefit liability, taxes	$ (2)
Adjustment to post-retirement health care benefit liability, taxes	$ (12)

Consolidated Financial Statements	3 Months Ended
Consolidated Financial Statements	Mar. 31, 2018
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, 2017. The balance sheet at December 31, 2017 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)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

RECENT ACCOUNTING PRONOUNCEMENTS

Recent Accounting Pronouncements Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606) And All Related ASUs	The standard requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires additional disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and assets recognized from costs incurred to obtain or fulfill a contract. The provisions of the standard, as well as all subsequently issued clarifications to the standard, are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The standard can be adopted using either a full retrospective or modified retrospective approach.	The Company has adopted this standard using the modified retrospective method. The Company recognized the cumulative- effect adjustment of initially applying this standard of $274,000 to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standard in effect for that period. Refer to Note 4 for further disclosure of the financial statement effect and other significant matters as a result of the adoption of this standard. Date of adoption: Q1 2018
ASU No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments	The standard provides guidance on eight specific cash flow issues to reduce diversity in reporting. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted.	The Company has adopted this standard and it did not have any impact on the Company's consolidated financial statements. Date of adoption: Q1 2018
ASU No. 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	The standard allows an entity to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The provisions of this standard are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued or made available for issuance.	The Company has adopted this standard and it did not have any impact on the Company's consolidated financial statements. Date of adoption: Q1 2018
ASU No. 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The standard allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The provisions of this standard are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption of the standard is permitted, including adoption in any interim period.	The Company has early adopted this standard. As a result of adopting this standard, the Company recorded an adjustment of $350,000 from accumulated other comprehensive income to retained earnings in the consolidated statement of shareholders' equity as of the beginning of the January 1, 2018, and will record any subsequent period adjustments, if changes to provisional amounts result in additional amounts stranded in accumulated other comprehensive income. Date of adoption: Q1 2018

Recent Accounting Pronouncements Not Yet 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 is currently evaluating the impact of this standard on the Company's consolidated financial statements and related disclosures, including the impact on the Company's current lease portfolio from both a lessor and lessee perspective. The adoption of this standard will primarily result in an increase in the assets and liabilities on the Company's consolidated balance sheet and related disclosures. Planned date of adoption: Q1 2019

Accounts Receivable

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE, NET

Accounts receivable consists of the following (in thousands):



	March 31, 2018			December 31, 2017
Trade accounts receivable	$	129,549		$	140,209
Costs in excess of billings	22,214			11,610
Total accounts receivables	151,763			151,819
Less allowance for doubtful accounts	(6,581		)	(6,434		)
Accounts receivable	$	145,182		$	145,385

Refer to Note 4 of the Company's consolidated financial statements included in Item 1 of this quarterly report on Form 10-Q for additional information concerning the Company's costs in excess of billings.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Revenue Revenue

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

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

Revenue recognition

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

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

Performance obligations satisfied at a point in time and significant judgments

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

Performance obligations satisfied over time and significant judgments

For contracts with customers which the Company satisfies a promise to the customer to construct a certain asset that the customer controls as it is being created or enhanced, or a promise to provide a product that has no alternative use to the Company and the Company has enforceable rights to payment, the Company satisfies the performance obligation and recognizes revenue over time. For the contracts to construct a certain asset, the Company determines that the customer controls the asset while it is being constructed because the performance obligation is satisfied on the customer's premise, and the customer controls any work in process arising from the Company's performance. For the contracts of products that have no alternative use and the Company has enforceable right to payment, the Company identifies these products as ones that are not a standard inventory item or the Company cannot readily direct the product to another customer or use without incurring a significant economic loss, or significant costs to rework the product.

When the promised products and services are to construct a certain asset that the customer controls, the entire contract is accounted for as one performance obligation. The Company uses the expected cost plus a margin approach to estimate the standalone selling price of the single performance obligation.

When the promised products do not have an alternative use to the Company and the Company has enforceable rights to payment, the transaction price is based on the estimated standalone selling price using the expected cost plus a margin approach. These promised products are generally capable of being distinct and accounted for as separate performance obligations.

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

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

The Company also recognizes revenues from services contracts over time. For these contracts, in order to estimate the standalone selling price of the performance obligation, the Company uses the adjusted market assessment approach, which is to evaluate the market in which the performance obligation is sold and estimates the price that customers in the market would be willing to pay. Further, the Company recognizes revenue over time during the term of the agreement as the customer is simultaneously receiving and consuming the benefits provided throughout the Company's performance. Therefore due to control transferring over time, the Company recognizes revenue on a straight-line basis throughout the contract period.

Remaining performance obligations

As of March 31, 2018, the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less. Therefore, any remaining performance obligations are not required to be disclosed.

Costs in excess of billings

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

Billings in excess of cost

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

Costs to obtain a contract with a customer

The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the Company expects the benefit of those costs to be longer than one year. As of March 31, 2018, the Company does not have any open contracts with an original expected duration of greater than one year, and therefore, we expense such costs as incurred. These incremental costs include, but are not limited to, sales commissions incurred to obtain a contract with a customer.

Contract assets and contract liabilities

The Company's contract assets and contract liabilities consist of costs in excess of billings and billings in excess of cost, respectively. The following table presents the beginning and ending balances and significant changes in the costs in excess of billings and billings in excess of cost balance during the three months ended March 31, 2018:



	Costs in Excess of Billings			Billings in Excess of Cost
Beginning balance, January 1, 2018 (1)	$	16,532		$	(12,779	)
Reclassification of the beginning balances of:
Costs in excess of billings to receivables	(11,647		)	—
Billings in excess of cost to revenue	—			8,340
Costs in excess of billings recognized, net of reclassification to receivables	17,329			—
Net billings in advance and cash payments not recognized as revenue	—			(7,133		)
Ending balance, March 31, 2018	$	22,214		$	(11,572	)



(1) Due to the adoption of ASC 606 effective January 1, 2018, the Company recorded a transition adjustment to the opening balance of "Costs in excess of billings" at January 1, 2018. There were no transition adjustments to the opening balance of "Billings in Excess of Cost" at January 1, 2018. Refer to "Transition disclosures" below for further explanation of cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606.

Transition disclosures

On January 1, 2018, the Company adopted the accounting standard ASC 606, Revenue from Contracts with Customers, only to contracts that were not completed at the date of initial application using the modified retrospective method. The Company recognized the cumulative effect of initially applying ASC 606 as an adjustment to the opening balance of retained earnings. The comparative period information has not been restated and continues to be reported under the accounting standards in effect for that period. The Company does not expect the adoption of this standard to have a material impact to the Company's net income on an ongoing basis.

A majority of the Company's revenues continue to be recognized when products are shipped or service is provided and the customer takes ownership and assumes the risk of loss. For certain custom fabricated products for which there is no alternative use and the Company has enforceable rights to payment for performance to date where revenue was previously recognized when products were shipped, the Company now recognizes revenue as the Company satisfies its performance over time in accordance with ASC 606.

The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606 is as follows (in thousands):



	Balance at December 31, 2017		Adjustments			Balance at January 1, 2018
Assets
Accounts receivable, net	$	145,385	$	4,922		$	150,307
Costs in excess of billings (1)	$	11,610	$	4,922		$	16,532
Inventories	$	86,372	$	(4,735	)	$	81,637
Total current assets	$	462,764	$	187		$	462,951
Total assets	$	991,385	$	187		$	991,572

Liabilities
Accrued expenses	$	75,467	$	(87	)	$	75,380
Total current liabilities	$	171,033	$	(87	)	$	170,946

Shareholders' equity
Retained earnings	$	274,562	$	274		$	274,836
Total shareholders' equity	$	531,719	$	274		$	531,993
Total liabilities and shareholders' equity	$	991,385	$	187		$	991,572



(1) The balance presented at December 31, 2017 for "Costs in excess of billings" represents the balance reported in Note 2 of the Company's annual report on Form 10-K for the year ended December 31, 2017. This balance was included within the total balance of "Accounts receivable, net" presented on the Company's Consolidated Balance Sheet on Form 10-K as of December 31, 2017. Due to the adoption of ASC 606 effective January 1, 2018, the Company recorded a transition adjustment to the opening balance of "Costs in excess of billings" at January 1, 2018 that is included in the "Accounts receivable, net" line item presented on the Company's Consolidated Balance Sheet and disclosed in Note 3 of this Form 10-Q for the three months ended March 31, 2018.

In accordance with ASC 606, the disclosure of the impact of adoption on the Company's consolidated statement of operations and balance sheet for the period ended March 31, 2018 is as follows (in thousands):



Consolidated Statement of Operations
	Three Months Ended March 31, 2018
	As Reported		Without Adoption of ASC 606		Effect of Change Higher (Lower)

Net sales	$	215,337	$	213,369	$	1,968
Cost of sales	167,019		165,580		1,439
Gross profit	48,318		47,789		529
Provision for income taxes	2,807		2,658		149
Net income	$	8,352	$	7,972	$	380



Consolidated Balance Sheet
	March 31, 2018
	As Reported		Without Adoption of ASC 606		Effect of Change Higher (Lower)
Assets
Accounts receivable, net	$	145,182	$	138,183	$	6,999
Inventories	90,236		96,371		(6,135		)
Total current assets	442,871		442,007		864
Total assets	967,143		966,279		864

Liabilities
Accrued expenses	53,254		53,044		210
Total current liabilities	145,917		145,707		210

Shareholders' equity
Retained earnings	283,538		282,884		654
Total shareholders' equity	541,955		541,301		654
Total liabilities and shareholders' equity	$	967,143	$	966,279	$	864

Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following (in thousands):



	March 31, 2018		December 31, 2017
Raw material	$	48,225	$	42,661
Work-in-process	7,481		10,598
Finished goods	34,530		33,113
Total inventories	$	90,236	$	86,372

Acquisitions

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

ACQUISITIONS

On February 22, 2017, the Company acquired all of the outstanding stock of Package Concierge. Package Concierge is a leading provider of multifamily electronic package delivery locker systems in the United States.

The acquisition of Package Concierge is expected to enable the Company to expand its position in the fast-growing package delivery solutions market. The results of Package Concierge have been included in the Company's consolidated financial results since the date of acquisition (within the Company's Residential Products segment). The final aggregate purchase consideration for the acquisition of Package Concierge was $18.9 million.

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 $16.8 million, which is not 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 building products 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	$	590
Working capital	(1,998		)
Property, plant and equipment	55
Acquired intangible assets	3,600
Other assets	8
Deferred income taxes	(128		)
Goodwill	16,790
Fair value of purchase consideration	$	18,917

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



	Fair Value		Estimated Useful Life
Trademarks	$	600	Indefinite
Technology	1,300		10 years
Customer relationships	1,700		7 years
Total	$	3,600

The acquisition of Package Concierge was funded from available cash on hand. The Company incurred certain acquisition-related costs composed of legal and consulting fees, and these costs were recognized as a component of selling, general and administrative expenses in the consolidated statements of operations. Acquisition related-costs were $102 thousand for the three months ended March 31, 2017.

Goodwill and Related Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND RELATED INTANGIBLE ASSETS

Goodwill

The changes in the carrying amount of goodwill for the three months ended March 31, 2018 are as follows (in thousands):



	Residential Products		Industrial and Infrastructure Products			Renewable Energy & Conservation		Total
Balance at December 31, 2017	$	198,075	$	54,280		$	68,719	$	321,074
Foreign currency translation	—		(163		)	861		698
Balance at March 31, 2018	$	198,075	$	54,117		$	69,580	$	321,772

Acquired Intangible Assets

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



	March 31, 2018				December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	45,159	$	—	$	45,107	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	5,848		3,166		5,876		3,062		5 to 15 Years
Unpatented technology	28,107		12,490		28,107		12,033		5 to 20 Years
Customer relationships	81,174		41,215		80,707		39,652		5 to 17 Years
Non-compete agreements	1,649		1,007		1,649		931		4 to 10 Years
	116,778		57,878		116,339		55,678
Total acquired intangible assets	$	161,937	$	57,878	$	161,446	$	55,678

The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands):



	2018		2017
Amortization expense	$	2,139	$	2,162

Amortization expense related to acquired intangible assets for the remainder of fiscal 2018 and the next five years thereafter is estimated as follows (in thousands):



	2018		2019		2020		2021		2022		2023
Amortization expense	$	6,087	$	7,654	$	7,142	$	6,539	$	6,127	$	5,588

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt

3 Months Ended

Mar. 31, 2018

Long-term Debt, Unclassified [Abstract]

LONG-TERM DEBT

Long-term debt consists of the following (in thousands):



	March 31, 2018			December 31, 2017
Senior Subordinated 6.25% Notes	$	210,000		$	210,000
Other debt	2,400			2,400
Less unamortized debt issuance costs	(2,183		)	(2,379		)
Total debt	210,217			210,021
Less current maturities	400			400
Total long-term debt	$	209,817		$	209,621

The Company's Fifth Amended and Restated Credit Agreement dated December 9, 2015 (the "Senior Credit Agreement") was amended to convert our secured asset based credit facility into a secured cash flow revolver, and terminates on December 9, 2020.

The Senior Credit Agreement provides for a revolving credit facility and letters of credit in an aggregate amount of $300 million. The Company has the option to request additional financing from the banks to either increase the revolving credit facility to $500 million or to provide a term loan of up to $200 million. The Senior Credit Agreement contains three financial covenants. As of March 31, 2018, the Company is in compliance with all three covenants.

Borrowings under the Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and certain real property of the Company’s significant domestic subsidiaries. Interest rates on the revolving credit facility are based on the LIBOR plus an additional margin that ranges from 1.25% to 2.25% for LIBOR loans based on the Total Leverage Ratio.

In addition, the revolving credit facility is subject to an undrawn commitment fee ranging between 0.20% and 0.30% based on the Total Leverage Ratio and the daily average undrawn balance.

Standby letters of credit of $9.7 million have been issued under the Senior Credit Agreement on behalf of the Company as of March 31, 2018. These letters of credit reduce the amount otherwise available under the revolving credit facility. As of March 31, 2018, the Company had $290.3 million of availability under the revolving credit facility. No borrowings were outstanding under the revolving credit facility at March 31, 2018 and December 31, 2017.

On January 31, 2013, the Company issued $210 million of 6.25% Senior Subordinated Notes ("6.25% Notes") due February 1, 2021.The provisions of the 6.25% Notes include, without limitation, restrictions on indebtedness, liens, and distributions from restricted subsidiaries, asset sales, affiliate transactions, dividends, and other restricted payments. Dividend payments are subject to annual limits and interest is paid semiannually on February 1 and August 1 of each year.

Accumulated Other Comprehensive (Loss) Income

3 Months Ended

Mar. 31, 2018

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

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

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



	Foreign Currency Translation Adjustment			Minimum Pension Liability Adjustment			Unamortized Post Retirement Health Care Costs			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017	$	(2,698	)	$	171		$	(2,809	)	$	(5,336	)	$	(970	)	$	(4,366	)
Cumulative effect of accounting change (see Note 2)	—			15			(365		)	(350		)	—			(350		)
Minimum pension and post retirement health care plan adjustments	—			(7		)	44			37			10			27
Foreign currency translation adjustment	110			—			—			110			—			110
Balance at March 31, 2018	$	(2,588	)	$	179		$	(3,130	)	$	(5,539	)	$	(960	)	$	(4,579	)

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 operations.

Equity-Based Compensation

3 Months Ended

Mar. 31, 2018

Share-based Compensation [Abstract]

EQUITY-BASED COMPENSATION

The shareholders of the Company have authorized: (1) the Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "Plan") that allows the Company to grant equity-based incentive compensation awards, in the form of options, restricted shares, restricted units, performance shares, and performance stock units, to eligible participants; and (2) the Gibraltar Industries, Inc. 2016 Stock Plan for Non-Employee Directors ("Non-Employee Directors Plan") that 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. The Company's 2005 Equity Incentive Plan (the "Prior Plan") was amended in 2015 to terminate issuance of further awards from the Prior Plan.

Equity Based Awards - Settled in Stock

The following table provides the number of stock unit awards granted during the three months ended March 31, which will convert to shares upon vesting, along with the weighted average grant date fair values:



	2018			2017
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	132,288	$	33.35	98,482	$	43.05
Restricted stock units	67,055	$	33.35	59,112	$	43.05
Options	—	$	—	20,000	$	43.05

(1) Performance stock units granted 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, 2018.

(2) Performance stock units granted include 78,482 units awarded in February 2017 which will convert to 23,546 shares to be issued in February 2020, representing 30% of the targeted 2017 award, based on the Company’s actual ROIC compared to ROIC target for the performance period ended December 31, 2017. The remaining performance stock units granted include 20,000 units awarded in February 2017. The number of these shares to be issued to the recipients will be determined based upon the ranking of the Company’s total shareholder return ("TSR") over a three (3) year performance period ended February 1, 2020 compared to the TSR of companies in the S&P Small Cap Industrial Sector over the same three year period.

Equity Based Awards - Settled in Cash

The Company's equity-based liabilities include performance based stock units settled in cash and a management stock purchase plan. As of March 31, 2018, the Company's total share-based liabilities recorded on the consolidated balance sheet was $31.8 million, of which $19.7 million was included in non-current liabilities.

Performance Stock Units - Settled in Cash

The Company awarded performance stock units ("PSUs") that will convert to cash after three years based upon a one year performance period. The cost of these awards is recognized over the requisite vesting period. The PSUs earned over the performance period are determined based on the Company’s actual ROIC relative to the ROIC targeted for the performance period.

During the 2016 performance period, the participants earned an aggregate of 256,000 PSUs, representing 200% the targeted 2016 award of 128,000. This award will convert to cash payable in the first quarter of 2019.

During the 2015 performance period, the participants earned an aggregate of 438,000 PSUs, representing 200% of the targeted 2015 award of 219,000. This award converted to cash and was paid in the first quarter of 2018.

The following table summarizes the compensation expense recognized for the PSUs, which will convert to cash, for the three months ended March 31, (in thousands):



	2018		2017
PSUs compensation expense	$	706	$	1,737

Management Stock Purchase Plan

The Management Stock Purchase Plan ("MSPP") provides participants the ability to defer a portion of their compensation or Directors’ fees, which deferral is converted to restricted stock units, and credited to an account. 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. Directors do not receive any company-matching on amounts deferred. The account represents a share-based liability that is 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 three months ended March 31,



	2018		2017
Restricted stock units credited	63,937		98,770
Share-based liabilities paid (in thousands)	$	4,717	$	2,353

Fair Value Measurements

3 Months Ended

Mar. 31, 2018

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 March 31, 2018 and December 31, 2017. The Company’s only financial instrument for which the carrying value differs from its fair value is long-term debt. At March 31, 2018 and December 31, 2017, the fair value of outstanding debt net of unamortized debt issuance costs was $214.0 million and $213.8 million, respectively, compared to its carrying value of $210.2 million and $210.0 million, respectively. The fair value of the Company’s 6.25% Notes is classified as Level 2 within the fair value hierarchy and was estimated based on quoted market prices adjusted for unamortized debt issuance costs.

- 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

Exit Activity Costs and Asset Impairments

3 Months Ended

Mar. 31, 2018

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

Exit activity costs were incurred during the three months ended March 31, 2018 which related to contract terminations, severance, and other moving and closing costs. In addition, the Company sold and leased back a facility which resulted in a gain, which was partially offset by inventory impairment charges incurred for discontinued products.

During the three months ended March 31, 2017, the Company incurred asset impairment charges and exit activity costs resulting from the above initiatives. Also, as a result of these initiatives, the Company closed three facilities during the first quarter of 2017.

The following tables set forth the asset impairment charges and exit activity costs incurred by segment during the three months ended March 31, related to the restructuring activities described above (in thousands):



	2018									2017
	Inventory write-downs &/or asset impairment recoveries, net			Exit activity costs, net			Total			Inventory write-downs &/or asset impairment recoveries			Exit activity costs		Total
Residential Products	$	(43	)	$	(123	)	$	(166	)	$	(21	)	$	185	$	164
Industrial & Infrastructure Products	(703		)	218			(485		)	(896		)	2,656		1,760
Renewable Energy & Conservation	19			117			136			—			1,050		1,050
Corporate	—			44			44			—			28		28
Total exit activity costs & asset impairments	$	(727	)	$	256		$	(471	)	$	(917	)	$	3,919	$	3,002

The following table provides a summary of where the asset impairments and exit activity costs were recorded in the consolidated statement of operations for the three months ended March 31, (in thousands):



	2018			2017
Cost of sales	$	37		$	994
Selling, general, and administrative (recoveries) expense	(508		)	2,008
Net asset impairment and exit activity (recoveries) charges	$	(471	)	$	3,002

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



	2018			2017
Balance at January 1	$	961		$	3,744
Exit activity costs recognized	256			3,919
Cash payments	(739		)	(4,617		)
Balance at March 31	$	478		$	3,046

Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three months ended March 31, and the applicable effective tax rates:



	2018			2017
Provision for income taxes	$	2,807		$	2,053
Effective tax rate	25.2		%	33.9		%

The change in the effective tax rate year over year is primarily due to the reduction in U.S. federal statutory tax rate from 35% to 21%. The effective tax rate for the three months ended March 31, 2018 was greater than the U.S. federal statutory rate of 21% due to state taxes and nondeductible permanent differences partially offset by favorable discrete items. The effective tax rate for the three months ended March 31, 2017 was less than the U.S. federal statutory rate of 35% due to net deductible permanent differences and favorable discrete items partially offset by state taxes and $0.9 million of pretax losses generated by the European residential solar racking business for which no tax benefit has been recorded as such benefit is not expected to be realizable.

On December 22, 2017, the Tax Cuts and Jobs Act ("Tax Reform Act") was signed into law. On this day, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Reform Act. The Company has recognized the provisional tax impacts related to the one-time transition tax, withholding tax and the revaluation of deferred tax assets and liabilities and included these amounts in its consolidated financial statements for the year ended December 31, 2017. As there is some uncertainty around the grandfathering provisions related to performance-based executive compensation, we have not included a provisional amount for deferred tax assets related to performance-based executive compensation as we believe that all of our plans are grandfathered. Our preliminary estimate of the one-time transition tax and the re-measurement of our deferred tax assets and liabilities is subject to the finalization of management’s analysis related to certain matters, such as developing interpretations of the provisions of the 2017 Tax Reform Act, changes to certain estimates and amounts related to the earnings and profits of certain subsidiaries and the filing of our tax returns, U.S. Treasury regulations, administrative interpretations or court decisions interpreting the 2017 Tax Reform Act may require further adjustments and changes in our estimates.

During the three month period ended March 31, 2018, the Company recognized an adjustment to the provisional amounts recorded at December 31, 2017. The following table sets forth the components of the adjustment which were recorded in income tax expense from continuing operations during three month period ended March 31, 2018, (in thousands):



Remeasurement of certain deferred tax balances (1)	114
One-time transition tax (2)	(233	)
Non-deductible performance based compensation (3)	51
Net benefit recorded to provisional income tax expense	(68	)

(1) The Company remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. We recorded a provisional income tax benefit of $16.2 million at December 31, 2017 related to the remeasurement of certain deferred tax balances.

(2) The Tax Reform Act provided for a one-time transition tax on post-1986 undistributed foreign subsidiary earnings and profits (“E&P”). The Company recognized a provisional $3.7 million of income tax expense at December 31, 2017 related to the one-time transition tax and related repatriation.

(3) The Tax Reform Act repealed the performance-based compensation exceptions to Section 162(m) $1.0 million deduction limitation. The Company did not provide for a provisional adjustment at December 31, 2017.

The Company has elected to account for GILTI tax in the period in which it is incurred, and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the year ended December 31, 2017, or during the quarter ended March 31, 2018. We have made sufficient progress in our calculations to reasonably estimate the effect on our effective tax rate. The adjustment increased our effective tax rate by 0.6%. We will continue to refine our calculations, which may result in changes to this amount.

The final determination of the one-time transition tax and the re-measurement of our deferred assets and liabilities will be completed as additional information becomes available, but no later than one year from the enactment of the 2017 Tax Reform Act.

In January 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated other Comprehensive Income, which gives entities the option to reclassify retained earning tax effects resulting from Tax Reform related to items in AOCI that the FASB refers to as having been stranded in AOCI. The Company must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period Tax Reform was enacted. We elected to early adopt ASU 2018-02. As a result of adopting this standard, we reclassified $350,000 from AOCI to retained earnings.

Earnings per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic earnings and diluted weighted-average shares outstanding are as follows for the three months ended March 31, (in thousands):



	2018		2017
Numerator:
Income from continuing operations	$	8,352	$	3,996
Net income available to common shareholders	$	8,352	$	3,996
Denominator for basic earnings per share:
Weighted average shares outstanding	31,786		31,688
Denominator for diluted earnings per share:
Weighted average shares outstanding	31,786		31,688
Common stock options and restricted stock	658		566
Weighted average shares and conversions	32,444		32,254

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 359,000 and 526,000 for the three months ended March 31, 2018 and 2017, respectively.

Segment Information

3 Months Ended

Mar. 31, 2018

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


(ii)	Industrial and Infrastructure Products, which primarily includes expanded and perforated metal, expansion joints, structural bearings and perimeter security; and


(iii)	Renewable Energy and Conservation, which primarily includes designing, engineering, manufacturing and installation of solar racking systems and greenhouse structures.

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 months ended March 31, (in thousands):



	Three Months Ended March 31,
	2018			2017
Net sales:
Residential Products	$	103,948		$	104,551
Industrial and Infrastructure Products	54,624			50,718
Less: Intersegment sales	(221		)	(456		)
Net Industrial and Infrastructure Products	54,403			50,262
Renewable Energy and Conservation	56,986			51,792
Total consolidated net sales	$	215,337		$	206,605

Income from operations:
Residential Products	$	13,238		$	15,641
Industrial and Infrastructure Products	2,602			(37		)
Renewable Energy and Conservation	4,062			3,340
Unallocated Corporate Expenses	(6,059		)	(9,265		)
Total income from operations	$	13,843		$	9,679

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



	Three Months Ended March 31, 2018
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	102,884	$	46,543	$	5,620	$	155,047
Over Time	1,064		7,860		51,366		60,290
Total	$	103,948	$	54,403	$	56,986	$	215,337



	Three Months Ended March 31, 2017
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	104,551	$	50,262	$	5,793	$	160,606
Over Time	—		—		45,999		45,999
Total	$	104,551	$	50,262	$	51,792	$	206,605

Supplemental Financial Information

3 Months Ended

Mar. 31, 2018

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

SUPPLEMENTAL FINANCIAL INFORMATION

The following information sets forth the consolidating summary financial statements of the issuer (Gibraltar Industries, Inc.) and guarantors, which guarantee the 6.25% Notes due February 1, 2021, and the non-guarantors. The guarantors are 100% owned domestic subsidiaries of the issuer and the guarantees are full, unconditional, joint and several.

Investments in subsidiaries are accounted for by the parent using the equity method of accounting. The guarantor subsidiaries and non-guarantor subsidiaries are presented on a combined basis. The principal elimination entries eliminate investments in subsidiaries and intercompany balances and transactions.

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net sales	$	—		$	204,467		$	12,330		$	(1,460	)	$	215,337
Cost of sales	—			158,584			9,758			(1,323		)	167,019
Gross profit	—			45,883			2,572			(137		)	48,318
Selling, general, and administrative expense	44			32,724			1,707			—			34,475
(Loss) income from operations	(44		)	13,159			865			(137		)	13,843
Interest expense (income)	3,402			(84		)	(49		)	—			3,269
Other expense (income)	—			28			(613		)	—			(585		)
(Loss) income before taxes	(3,446		)	13,215			1,527			(137		)	11,159
(Benefit of) provision for income taxes	(965		)	3,335			437			—			2,807
Equity in earnings from subsidiaries	10,970			1,090			—			(12,060		)	—
Net income	$	8,489		$	10,970		$	1,090		$	(12,197	)	$	8,352

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net sales	$	—		$	197,748		$	11,242		$	(2,385	)	$	206,605
Cost of sales	—			150,507			8,982			(2,139		)	157,350
Gross profit	—			47,241			2,260			(246		)	49,255
Selling, general, and administrative expense	43			36,506			3,027			—			39,576
(Loss) income from operations	(43		)	10,735			(767		)	(246		)	9,679
Interest expense (income)	3,402			192			(18		)	—			3,576
Other expense (income)	—			130			(76		)	—			54
(Loss) income before taxes	(3,445		)	10,413			(673		)	(246		)	6,049
(Benefit of) provision for income taxes	(1,344		)	3,378			19			—			2,053
Equity in earnings from subsidiaries	6,343			(692		)	—			(5,651		)	—
Net income (loss)	$	4,242		$	6,343		$	(692	)	$	(5,897	)	$	3,996

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Total
Net income	$	8,489	$	10,970		$	1,090	$	(12,197	)	$	8,352
Other comprehensive income (loss):
Foreign currency translation adjustment	—		—			110		—			110
Cumulative effect of change in accounting (see Note 2)	—		(350		)	—		—			(350		)
Adjustment to retirement benefit liability, net of tax	—		(5		)	—		—			(5		)
Adjustment to post employment health care benefit liability, net of tax	—		32			—		—			32
Other comprehensive (loss) income	—		(323		)	110		—			(213		)
Total comprehensive income	$	8,489	$	10,647		$	1,200	$	(12,197	)	$	8,139

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net income (loss)	$	4,242	$	6,343		$	(692	)	$	(5,897	)	$	3,996
Other comprehensive income (loss):
Foreign currency translation adjustment	—		—			679			—			679
Adjustment to retirement benefit liability, net of tax	—		(3		)	—			—			(3		)
Adjustment to post employment health care benefit liability, net of tax	—		29			—			—			29
Other comprehensive income	—		26			679			—			705
Total comprehensive income (loss)	$	4,242	$	6,369		$	(13	)	$	(5,897	)	$	4,701

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING BALANCE SHEETS

MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	—	$	172,930	$	27,811		$	—		$	200,741
Accounts receivable, net	—		139,143		6,039			—			145,182
Intercompany balances	914		3,362		(4,276		)	—			—
Inventories	—		86,265		3,971			—			90,236
Other current assets	1,048		2,114		3,550			—			6,712
Total current assets	1,962		403,814		37,095			—			442,871
Property, plant, and equipment, net	—		90,625		3,046			—			93,671
Goodwill	—		298,258		23,514			—			321,772
Acquired intangibles	—		95,275		8,784			—			104,059
Other assets	—		4,770		—			—			4,770
Investment in subsidiaries	750,823		62,594		—			(813,417		)	—
	$	752,785	$	955,336	$	72,439		$	(813,417	)	$	967,143
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	—	$	76,994	$	3,697		$	—		$	80,691
Accrued expenses	2,188		49,631		1,435			—			53,254
Billings in excess of cost	—		9,280		2,292						11,572
Current maturities of long-term debt	—		400		—			—			400
Total current liabilities	2,188		136,305		7,424			—			145,917
Long-term debt	208,642		1,175		—			—			209,817
Deferred income taxes	—		28,918		2,421			—			31,339
Other non-current liabilities	—		38,115		—			—			38,115
Shareholders’ equity	541,955		750,823		62,594			(813,417		)	541,955
	$	752,785	$	955,336	$	72,439		$	(813,417	)	$	967,143

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING BALANCE SHEETS

DECEMBER 31, 2017

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	—	$	192,604		$	29,676		$	—		$	222,280
Accounts receivable, net	—		138,903			6,482			—			145,385
Intercompany balances	324		4,166			(4,490		)	—			—
Inventories	—		82,457			3,915			—			86,372
Other current assets	5,415		(368		)	3,680			—			8,727
Total current assets	5,739		417,762			39,263			—			462,764
Property, plant, and equipment, net	—		93,906			3,192			—			97,098
Goodwill	—		298,258			22,816			—			321,074
Acquired intangibles	—		97,171			8,597			—			105,768
Other assets	—		4,681			—			—			4,681
Investment in subsidiaries	739,970		61,746			—			(801,716		)	—
	$	745,709	$	973,524		$	73,868		$	(801,716	)	$	991,385
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	—	$	77,786		$	4,601		$	—		$	82,387
Accrued expenses	5,469		67,746			2,252			—			75,467
Billings in excess of cost	—		9,840			2,939			—			12,779
Current maturities of long-term debt	—		400			—			—			400
Total current liabilities	5,469		155,772			9,792			—			171,033
Long-term debt	208,521		1,100			—			—			209,621
Deferred income taxes	—		28,907			2,330			—			31,237
Other non-current liabilities	—		47,775			—			—			47,775
Shareholders’ equity	531,719		739,970			61,746			(801,716		)	531,719
	$	745,709	$	973,524		$	73,868		$	(801,716	)	$	991,385

GIBRALTAR INDUSTRIES, INC.

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Total
Cash Flows from Operating Activities
Net cash used in operating activities	$	(6,606	)	$	(14,829	)	$	(771	)	$	—	$	(22,206	)
Cash Flows from Investing Activities
Net proceeds from sale of property and equipment	—			2,823			—			—		2,823
Purchases of property, plant, and equipment	—			(1,008		)	(25		)	—		(1,033		)
Net cash provided by (used in) investing activities	—			1,815			(25		)	—		1,790
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(850		)	—			—			—		(850		)
Net proceeds from issuance of common stock	226			—			—			—		226
Intercompany financing	7,230			(6,660		)	(570		)	—		—
Net cash provided by (used in) financing activities	6,606			(6,660		)	(570		)	—		(624		)
Effect of exchange rate changes on cash	—			—			(499		)	—		(499		)
Net decrease in cash and cash equivalents	—			(19,674		)	(1,865		)	—		(21,539		)
Cash and cash equivalents at beginning of year	—			192,604			29,676			—		222,280
Cash and cash equivalents at end of period	$	—		$	172,930		$	27,811		$	—	$	200,741

GIBRALTAR INDUSTRIES, INC.

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Total
Cash Flows from Operating Activities
Net cash (used in) provided by operating activities	$	(6,605	)	$	12,141		$	(3,193	)	$	—	$	2,343
Cash Flows from Investing Activities
Cash paid for acquisitions	—			(18,561		)	—			—		(18,561		)
Net proceeds from sale of property and equipment	—			9,081			152			—		9,233
Purchases of property, plant, and equipment	—			(1,326		)	(127		)	—		(1,453		)
Net cash (used in) provided by investing activities	—			(10,806		)	25			—		(10,781		)
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(922		)	—			—			—		(922		)
Net proceeds from issuance of common stock	11			—			—			—		11
Intercompany financing	7,516			(6,398		)	(1,118		)	—		—
Net cash provided by (used in) financing activities	6,605			(6,398		)	(1,118		)	—		(911		)
Effect of exchange rate changes on cash	—			—			73			—		73
Net decrease in cash and cash equivalents	—			(5,063		)	(4,213		)	—		(9,276		)
Cash and cash equivalents at beginning of year	—			143,826			26,351			—		170,177
Cash and cash equivalents at end of period	$	—		$	138,763		$	22,138		$	—	$	160,901

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Recent Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606) And All Related ASUs	The standard requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires additional disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and assets recognized from costs incurred to obtain or fulfill a contract. The provisions of the standard, as well as all subsequently issued clarifications to the standard, are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The standard can be adopted using either a full retrospective or modified retrospective approach.	The Company has adopted this standard using the modified retrospective method. The Company recognized the cumulative- effect adjustment of initially applying this standard of $274,000 to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standard in effect for that period. Refer to Note 4 for further disclosure of the financial statement effect and other significant matters as a result of the adoption of this standard. Date of adoption: Q1 2018
ASU No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments	The standard provides guidance on eight specific cash flow issues to reduce diversity in reporting. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted.	The Company has adopted this standard and it did not have any impact on the Company's consolidated financial statements. Date of adoption: Q1 2018
ASU No. 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	The standard allows an entity to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The provisions of this standard are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued or made available for issuance.	The Company has adopted this standard and it did not have any impact on the Company's consolidated financial statements. Date of adoption: Q1 2018
ASU No. 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The standard allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The provisions of this standard are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption of the standard is permitted, including adoption in any interim period.	The Company has early adopted this standard. As a result of adopting this standard, the Company recorded an adjustment of $350,000 from accumulated other comprehensive income to retained earnings in the consolidated statement of shareholders' equity as of the beginning of the January 1, 2018, and will record any subsequent period adjustments, if changes to provisional amounts result in additional amounts stranded in accumulated other comprehensive income. Date of adoption: Q1 2018

Recent Accounting Pronouncements Not Yet 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 is currently evaluating the impact of this standard on the Company's consolidated financial statements and related disclosures, including the impact on the Company's current lease portfolio from both a lessor and lessee perspective. The adoption of this standard will primarily result in an increase in the assets and liabilities on the Company's consolidated balance sheet and related disclosures. Planned date of adoption: Q1 2019

Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):



	March 31, 2018			December 31, 2017
Trade accounts receivable	$	129,549		$	140,209
Costs in excess of billings	22,214			11,610
Total accounts receivables	151,763			151,819
Less allowance for doubtful accounts	(6,581		)	(6,434		)
Accounts receivable	$	145,182		$	145,385

Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table presents the beginning and ending balances and significant changes in the costs in excess of billings and billings in excess of cost balance during the three months ended March 31, 2018:



	Costs in Excess of Billings			Billings in Excess of Cost
Beginning balance, January 1, 2018 (1)	$	16,532		$	(12,779	)
Reclassification of the beginning balances of:
Costs in excess of billings to receivables	(11,647		)	—
Billings in excess of cost to revenue	—			8,340
Costs in excess of billings recognized, net of reclassification to receivables	17,329			—
Net billings in advance and cash payments not recognized as revenue	—			(7,133		)
Ending balance, March 31, 2018	$	22,214		$	(11,572	)



(1) Due to the adoption of ASC 606 effective January 1, 2018, the Company recorded a transition adjustment to the opening balance of "Costs in excess of billings" at January 1, 2018. There were no transition adjustments to the opening balance of "Billings in Excess of Cost" at January 1, 2018. Refer to "Transition disclosures" below for further explanation of cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606.

Schedule of New Accounting Pronouncements and Changes in Accounting Principles



Consolidated Statement of Operations
	Three Months Ended March 31, 2018
	As Reported		Without Adoption of ASC 606		Effect of Change Higher (Lower)

Net sales	$	215,337	$	213,369	$	1,968
Cost of sales	167,019		165,580		1,439
Gross profit	48,318		47,789		529
Provision for income taxes	2,807		2,658		149
Net income	$	8,352	$	7,972	$	380



Consolidated Balance Sheet
	March 31, 2018
	As Reported		Without Adoption of ASC 606		Effect of Change Higher (Lower)
Assets
Accounts receivable, net	$	145,182	$	138,183	$	6,999
Inventories	90,236		96,371		(6,135		)
Total current assets	442,871		442,007		864
Total assets	967,143		966,279		864

Liabilities
Accrued expenses	53,254		53,044		210
Total current liabilities	145,917		145,707		210

Shareholders' equity
Retained earnings	283,538		282,884		654
Total shareholders' equity	541,955		541,301		654
Total liabilities and shareholders' equity	$	967,143	$	966,279	$	864

The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606 is as follows (in thousands):



	Balance at December 31, 2017		Adjustments			Balance at January 1, 2018
Assets
Accounts receivable, net	$	145,385	$	4,922		$	150,307
Costs in excess of billings (1)	$	11,610	$	4,922		$	16,532
Inventories	$	86,372	$	(4,735	)	$	81,637
Total current assets	$	462,764	$	187		$	462,951
Total assets	$	991,385	$	187		$	991,572

Liabilities
Accrued expenses	$	75,467	$	(87	)	$	75,380
Total current liabilities	$	171,033	$	(87	)	$	170,946

Shareholders' equity
Retained earnings	$	274,562	$	274		$	274,836
Total shareholders' equity	$	531,719	$	274		$	531,993
Total liabilities and shareholders' equity	$	991,385	$	187		$	991,572



(1) The balance presented at December 31, 2017 for "Costs in excess of billings" represents the balance reported in Note 2 of the Company's annual report on Form 10-K for the year ended December 31, 2017. This balance was included within the total balance of "Accounts receivable, net" presented on the Company's Consolidated Balance Sheet on Form 10-K as of December 31, 2017. Due to the adoption of ASC 606 effective January 1, 2018, the Company recorded a transition adjustment to the opening balance of "Costs in excess of billings" at January 1, 2018 that is included in the "Accounts receivable, net" line item presented on the Company's Consolidated Balance Sheet and disclosed in Note 3 of this Form 10-Q for the three months ended March 31, 2018.

Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule Of Inventories

Inventories consist of the following (in thousands):



	March 31, 2018		December 31, 2017
Raw material	$	48,225	$	42,661
Work-in-process	7,481		10,598
Finished goods	34,530		33,113
Total inventories	$	90,236	$	86,372

Acquisitions (Tables)

3 Months Ended

Mar. 31, 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	$	590
Working capital	(1,998		)
Property, plant and equipment	55
Acquired intangible assets	3,600
Other assets	8
Deferred income taxes	(128		)
Goodwill	16,790
Fair value of purchase consideration	$	18,917

Intangible Assets Acquired

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



	Fair Value		Estimated Useful Life
Trademarks	$	600	Indefinite
Technology	1,300		10 years
Customer relationships	1,700		7 years
Total	$	3,600

Goodwill and Related Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Changes In Carrying Amount Of Goodwill

The changes in the carrying amount of goodwill for the three months ended March 31, 2018 are as follows (in thousands):



	Residential Products		Industrial and Infrastructure Products			Renewable Energy & Conservation		Total
Balance at December 31, 2017	$	198,075	$	54,280		$	68,719	$	321,074
Foreign currency translation	—		(163		)	861		698
Balance at March 31, 2018	$	198,075	$	54,117		$	69,580	$	321,772

Schedule Of Acquired Intangible Assets

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



	March 31, 2018				December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	45,159	$	—	$	45,107	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	5,848		3,166		5,876		3,062		5 to 15 Years
Unpatented technology	28,107		12,490		28,107		12,033		5 to 20 Years
Customer relationships	81,174		41,215		80,707		39,652		5 to 17 Years
Non-compete agreements	1,649		1,007		1,649		931		4 to 10 Years
	116,778		57,878		116,339		55,678
Total acquired intangible assets	$	161,937	$	57,878	$	161,446	$	55,678

Schedule of Acquired Intangible Asset Amortization Expense

The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands):



	2018		2017
Amortization expense	$	2,139	$	2,162

Schedule Of Amortization Expense

Amortization expense related to acquired intangible assets for the remainder of fiscal 2018 and the next five years thereafter is estimated as follows (in thousands):



	2018		2019		2020		2021		2022		2023
Amortization expense	$	6,087	$	7,654	$	7,142	$	6,539	$	6,127	$	5,588

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Long-term Debt, Unclassified [Abstract]

Schedule Of Long-Term Debt

Long-term debt consists of the following (in thousands):



	March 31, 2018			December 31, 2017
Senior Subordinated 6.25% Notes	$	210,000		$	210,000
Other debt	2,400			2,400
Less unamortized debt issuance costs	(2,183		)	(2,379		)
Total debt	210,217			210,021
Less current maturities	400			400
Total long-term debt	$	209,817		$	209,621

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Accumulated Other Comprehensive (Loss) Income (Tables)

3 Months Ended

Mar. 31, 2018

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

Schedule Of Components Of Accumulated Other Comprehensive Loss

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



	Foreign Currency Translation Adjustment			Minimum Pension Liability Adjustment			Unamortized Post Retirement Health Care Costs			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017	$	(2,698	)	$	171		$	(2,809	)	$	(5,336	)	$	(970	)	$	(4,366	)
Cumulative effect of accounting change (see Note 2)	—			15			(365		)	(350		)	—			(350		)
Minimum pension and post retirement health care plan adjustments	—			(7		)	44			37			10			27
Foreign currency translation adjustment	110			—			—			110			—			110
Balance at March 31, 2018	$	(2,588	)	$	179		$	(3,130	)	$	(5,539	)	$	(960	)	$	(4,579	)

Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Share-based Compensation [Abstract]

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



	2018			2017
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	132,288	$	33.35	98,482	$	43.05
Restricted stock units	67,055	$	33.35	59,112	$	43.05
Options	—	$	—	20,000	$	43.05

Schedule of PSU Conversion

Schedule Of Compensation Expense Recognized From Change In Fair Value And Vesting Of Performance Stock Units

The following table summarizes the compensation expense recognized for the PSUs, which will convert to cash, for the three months ended March 31, (in thousands):



	2018		2017
PSUs compensation expense	$	706	$	1,737

Management Stock Purchase Plan



	2018		2017
Restricted stock units credited	63,937		98,770
Share-based liabilities paid (in thousands)	$	4,717	$	2,353

Exit Activity Costs and Asset Impairments (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Summary Of Exit Activity Costs And Asset Impairments



	2018			2017
Cost of sales	$	37		$	994
Selling, general, and administrative (recoveries) expense	(508		)	2,008
Net asset impairment and exit activity (recoveries) charges	$	(471	)	$	3,002

Exit activity costs were incurred during the three months ended March 31, 2018 which related to contract terminations, severance, and other moving and closing costs.

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):



	2018			2017
Balance at January 1	$	961		$	3,744
Exit activity costs recognized	256			3,919
Cash payments	(739		)	(4,617		)
Balance at March 31	$	478		$	3,046

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

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 months ended March 31, and the applicable effective tax rates:



	2018			2017
Provision for income taxes	$	2,807		$	2,053
Effective tax rate	25.2		%	33.9		%

The following table sets forth the components of the adjustment which were recorded in income tax expense from continuing operations during three month period ended March 31, 2018, (in thousands):



Remeasurement of certain deferred tax balances (1)	114
One-time transition tax (2)	(233	)
Non-deductible performance based compensation (3)	51
Net benefit recorded to provisional income tax expense	(68	)

Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule Of Computation Of Basic And Diluted Loss Per Share

the three months ended March 31, (in thousands):



	2018		2017
Numerator:
Income from continuing operations	$	8,352	$	3,996
Net income available to common shareholders	$	8,352	$	3,996
Denominator for basic earnings per share:
Weighted average shares outstanding	31,786		31,688
Denominator for diluted earnings per share:
Weighted average shares outstanding	31,786		31,688
Common stock options and restricted stock	658		566
Weighted average shares and conversions	32,444		32,254

Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

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 months ended March 31, (in thousands):



	Three Months Ended March 31,
	2018			2017
Net sales:
Residential Products	$	103,948		$	104,551
Industrial and Infrastructure Products	54,624			50,718
Less: Intersegment sales	(221		)	(456		)
Net Industrial and Infrastructure Products	54,403			50,262
Renewable Energy and Conservation	56,986			51,792
Total consolidated net sales	$	215,337		$	206,605

Income from operations:
Residential Products	$	13,238		$	15,641
Industrial and Infrastructure Products	2,602			(37		)
Renewable Energy and Conservation	4,062			3,340
Unallocated Corporate Expenses	(6,059		)	(9,265		)
Total income from operations	$	13,843		$	9,679

Disaggregation of Revenue

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



	Three Months Ended March 31, 2018
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	102,884	$	46,543	$	5,620	$	155,047
Over Time	1,064		7,860		51,366		60,290
Total	$	103,948	$	54,403	$	56,986	$	215,337



	Three Months Ended March 31, 2017
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	104,551	$	50,262	$	5,793	$	160,606
Over Time	—		—		45,999		45,999
Total	$	104,551	$	50,262	$	51,792	$	206,605

Supplemental Financial Information (Tables)

3 Months Ended

Mar. 31, 2018

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule Of Consolidating Statements Of Operations

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net sales	$	—		$	204,467		$	12,330		$	(1,460	)	$	215,337
Cost of sales	—			158,584			9,758			(1,323		)	167,019
Gross profit	—			45,883			2,572			(137		)	48,318
Selling, general, and administrative expense	44			32,724			1,707			—			34,475
(Loss) income from operations	(44		)	13,159			865			(137		)	13,843
Interest expense (income)	3,402			(84		)	(49		)	—			3,269
Other expense (income)	—			28			(613		)	—			(585		)
(Loss) income before taxes	(3,446		)	13,215			1,527			(137		)	11,159
(Benefit of) provision for income taxes	(965		)	3,335			437			—			2,807
Equity in earnings from subsidiaries	10,970			1,090			—			(12,060		)	—
Net income	$	8,489		$	10,970		$	1,090		$	(12,197	)	$	8,352

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net sales	$	—		$	197,748		$	11,242		$	(2,385	)	$	206,605
Cost of sales	—			150,507			8,982			(2,139		)	157,350
Gross profit	—			47,241			2,260			(246		)	49,255
Selling, general, and administrative expense	43			36,506			3,027			—			39,576
(Loss) income from operations	(43		)	10,735			(767		)	(246		)	9,679
Interest expense (income)	3,402			192			(18		)	—			3,576
Other expense (income)	—			130			(76		)	—			54
(Loss) income before taxes	(3,445		)	10,413			(673		)	(246		)	6,049
(Benefit of) provision for income taxes	(1,344		)	3,378			19			—			2,053
Equity in earnings from subsidiaries	6,343			(692		)	—			(5,651		)	—
Net income (loss)	$	4,242		$	6,343		$	(692	)	$	(5,897	)	$	3,996

Schedule Of Consolidating Statements Of Comprehensive Income

IBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Total
Net income	$	8,489	$	10,970		$	1,090	$	(12,197	)	$	8,352
Other comprehensive income (loss):
Foreign currency translation adjustment	—		—			110		—			110
Cumulative effect of change in accounting (see Note 2)	—		(350		)	—		—			(350		)
Adjustment to retirement benefit liability, net of tax	—		(5		)	—		—			(5		)
Adjustment to post employment health care benefit liability, net of tax	—		32			—		—			32
Other comprehensive (loss) income	—		(323		)	110		—			(213		)
Total comprehensive income	$	8,489	$	10,647		$	1,200	$	(12,197	)	$	8,139

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Net income (loss)	$	4,242	$	6,343		$	(692	)	$	(5,897	)	$	3,996
Other comprehensive income (loss):
Foreign currency translation adjustment	—		—			679			—			679
Adjustment to retirement benefit liability, net of tax	—		(3		)	—			—			(3		)
Adjustment to post employment health care benefit liability, net of tax	—		29			—			—			29
Other comprehensive income	—		26			679			—			705
Total comprehensive income (loss)	$	4,242	$	6,369		$	(13	)	$	(5,897	)	$	4,701

Schedule Of Consolidating Balance Sheets

STRIES, INC.

CONSOLIDATING BALANCE SHEETS

MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	—	$	172,930	$	27,811		$	—		$	200,741
Accounts receivable, net	—		139,143		6,039			—			145,182
Intercompany balances	914		3,362		(4,276		)	—			—
Inventories	—		86,265		3,971			—			90,236
Other current assets	1,048		2,114		3,550			—			6,712
Total current assets	1,962		403,814		37,095			—			442,871
Property, plant, and equipment, net	—		90,625		3,046			—			93,671
Goodwill	—		298,258		23,514			—			321,772
Acquired intangibles	—		95,275		8,784			—			104,059
Other assets	—		4,770		—			—			4,770
Investment in subsidiaries	750,823		62,594		—			(813,417		)	—
	$	752,785	$	955,336	$	72,439		$	(813,417	)	$	967,143
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	—	$	76,994	$	3,697		$	—		$	80,691
Accrued expenses	2,188		49,631		1,435			—			53,254
Billings in excess of cost	—		9,280		2,292						11,572
Current maturities of long-term debt	—		400		—			—			400
Total current liabilities	2,188		136,305		7,424			—			145,917
Long-term debt	208,642		1,175		—			—			209,817
Deferred income taxes	—		28,918		2,421			—			31,339
Other non-current liabilities	—		38,115		—			—			38,115
Shareholders’ equity	541,955		750,823		62,594			(813,417		)	541,955
	$	752,785	$	955,336	$	72,439		$	(813,417	)	$	967,143

GIBRALTAR INDUSTRIES, INC.

CONSOLIDATING BALANCE SHEETS

DECEMBER 31, 2017

(in thousands)



	Gibraltar Industries, Inc.		Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	—	$	192,604		$	29,676		$	—		$	222,280
Accounts receivable, net	—		138,903			6,482			—			145,385
Intercompany balances	324		4,166			(4,490		)	—			—
Inventories	—		82,457			3,915			—			86,372
Other current assets	5,415		(368		)	3,680			—			8,727
Total current assets	5,739		417,762			39,263			—			462,764
Property, plant, and equipment, net	—		93,906			3,192			—			97,098
Goodwill	—		298,258			22,816			—			321,074
Acquired intangibles	—		97,171			8,597			—			105,768
Other assets	—		4,681			—			—			4,681
Investment in subsidiaries	739,970		61,746			—			(801,716		)	—
	$	745,709	$	973,524		$	73,868		$	(801,716	)	$	991,385
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	—	$	77,786		$	4,601		$	—		$	82,387
Accrued expenses	5,469		67,746			2,252			—			75,467
Billings in excess of cost	—		9,840			2,939			—			12,779
Current maturities of long-term debt	—		400			—			—			400
Total current liabilities	5,469		155,772			9,792			—			171,033
Long-term debt	208,521		1,100			—			—			209,621
Deferred income taxes	—		28,907			2,330			—			31,237
Other non-current liabilities	—		47,775			—			—			47,775
Shareholders’ equity	531,719		739,970			61,746			(801,716		)	531,719
	$	745,709	$	973,524		$	73,868		$	(801,716	)	$	991,385

Schedule Of Condensed Consolidating Statements Of Cash Flows

GIBRALTAR INDUSTRIES, INC.

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

THREE MONTHS ENDED MARCH 31, 2018

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Total
Cash Flows from Operating Activities
Net cash used in operating activities	$	(6,606	)	$	(14,829	)	$	(771	)	$	—	$	(22,206	)
Cash Flows from Investing Activities
Net proceeds from sale of property and equipment	—			2,823			—			—		2,823
Purchases of property, plant, and equipment	—			(1,008		)	(25		)	—		(1,033		)
Net cash provided by (used in) investing activities	—			1,815			(25		)	—		1,790
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(850		)	—			—			—		(850		)
Net proceeds from issuance of common stock	226			—			—			—		226
Intercompany financing	7,230			(6,660		)	(570		)	—		—
Net cash provided by (used in) financing activities	6,606			(6,660		)	(570		)	—		(624		)
Effect of exchange rate changes on cash	—			—			(499		)	—		(499		)
Net decrease in cash and cash equivalents	—			(19,674		)	(1,865		)	—		(21,539		)
Cash and cash equivalents at beginning of year	—			192,604			29,676			—		222,280
Cash and cash equivalents at end of period	$	—		$	172,930		$	27,811		$	—	$	200,741

GIBRALTAR INDUSTRIES, INC.

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

THREE MONTHS ENDED MARCH 31, 2017

(in thousands)



	Gibraltar Industries, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Total
Cash Flows from Operating Activities
Net cash (used in) provided by operating activities	$	(6,605	)	$	12,141		$	(3,193	)	$	—	$	2,343
Cash Flows from Investing Activities
Cash paid for acquisitions	—			(18,561		)	—			—		(18,561		)
Net proceeds from sale of property and equipment	—			9,081			152			—		9,233
Purchases of property, plant, and equipment	—			(1,326		)	(127		)	—		(1,453		)
Net cash (used in) provided by investing activities	—			(10,806		)	25			—		(10,781		)
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(922		)	—			—			—		(922		)
Net proceeds from issuance of common stock	11			—			—			—		11
Intercompany financing	7,516			(6,398		)	(1,118		)	—		—
Net cash provided by (used in) financing activities	6,605			(6,398		)	(1,118		)	—		(911		)
Effect of exchange rate changes on cash	—			—			73			—		73
Net decrease in cash and cash equivalents	—			(5,063		)	(4,213		)	—		(9,276		)
Cash and cash equivalents at beginning of year	—			143,826			26,351			—		170,177
Cash and cash equivalents at end of period	$	—		$	138,763		$	22,138		$	—	$	160,901

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 283,538	$ 274,836	$ 274,562
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,579		$ 4,366
Accounting Standards Update 2018-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	350
Accumulated Other Comprehensive Income (Loss), Net of Tax	350
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 654	$ 274

Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade accounts receivable	$ 129,549		$ 140,209
Costs in excess of billings	22,214		11,610
Total accounts receivables	151,763		151,819
Less allowance for doubtful accounts	(6,581)		(6,434)
Accounts receivable	$ 145,182	$ 150,307	$ 145,385

Revenue - Narrative (Details)	3 Months Ended
Revenue - Narrative (Details)	Mar. 31, 2018
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract payment terms	30 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract payment terms	60 days
Remaining performance obligation expected timing of satisfaction	1 year

Revenue - Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Costs in Excess of Billings
Beginning balance, January 1, 2018	$ 16,532
Costs in excess of billings to receivables	(11,647)
Costs in excess of billings recognized, net of reclassification to receivables	17,329
Ending balance, March 31, 2018	22,214
Billings in Excess of Cost
Beginning balance, January 1, 2018	(12,779)
Billings in excess of cost to revenue	8,340
Net billings in advance and cash payments not recognized as revenue	(7,133)
Ending balance, March 31, 2018	$ (11,572)

Revenue - Effects of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 145,182		$ 150,307	$ 145,385
Costs in excess of billings	22,214		16,532	16,532
Inventories	90,236		81,637	86,372
Total current assets	442,871		462,951	462,764
Total assets	967,143		991,572	991,385
Liabilities
Accrued expenses	53,254		75,380	75,467
Total current liabilities	145,917		170,946	171,033
Shareholders' equity
Retained earnings	283,538		274,836	274,562
Total shareholders' equity	541,955		531,993	531,719
Total liabilities and shareholders' equity	967,143		991,572	991,385
Net sales:	215,337	$ 206,605
Cost of sales	167,019	157,350
Gross profit	48,318	49,255
Provision for income taxes	2,807	2,053
Net income	8,352	$ 3,996
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Accounts receivable, net	138,183			145,385
Costs in excess of billings				11,610
Inventories	96,371			86,372
Total current assets	442,007			462,764
Total assets	966,279			991,385
Liabilities
Accrued expenses	53,044			75,467
Total current liabilities	145,707			171,033
Shareholders' equity
Retained earnings	282,884			274,562
Total shareholders' equity	541,301			531,719
Total liabilities and shareholders' equity	966,279			$ 991,385
Net sales:	213,369
Cost of sales	165,580
Gross profit	47,789
Provision for income taxes	2,658
Net income	7,972
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Assets
Accounts receivable, net	6,999		4,922
Costs in excess of billings			4,922
Inventories	(6,135)		(4,735)
Total current assets	864		187
Total assets	864		187
Liabilities
Accrued expenses	210		(87)
Total current liabilities	210		(87)
Shareholders' equity
Retained earnings	654		274
Total shareholders' equity	654		274
Total liabilities and shareholders' equity	864		$ 187
Net sales:	1,968
Cost of sales	1,439
Gross profit	529
Provision for income taxes	149
Net income	$ 380

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw material	$ 48,225		$ 42,661
Work-in-process	7,481		10,598
Finished goods	34,530		33,113
Total inventories	$ 90,236	$ 81,637	$ 86,372

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Feb. 22, 2017
Business Acquisition [Line Items]
Goodwill			$ 321,772	$ 321,074
Package Concierge
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 18,900
Goodwill					$ 16,790
Acquisition related costs		$ 102

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Feb. 22, 2017
Business Acquisition [Line Items]
Goodwill	$ 321,772	$ 321,074
Package Concierge
Business Acquisition [Line Items]
Cash			$ 590
Working capital			(1,998)
Property, plant, and equipment			55
Acquired intangible assets			3,600
Other assets			8
Deferred income taxes			(128)
Goodwill			16,790
Fair value of purchase consideration			$ 18,917

Acquisitions (Schedule of Acquired Intangible Assets) (Details) $ in Thousands	Feb. 22, 2017 USD ($)
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years
Package Concierge
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,600
Package Concierge \| Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	1,300
Package Concierge \| Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	1,700
Package Concierge \| Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 600

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at	$ 321,074
Foreign currency translation	698
Balance at	321,772
Residential Products
Goodwill [Roll Forward]
Balance at	198,075
Foreign currency translation	0
Balance at	198,075
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at	54,280
Foreign currency translation	(163)
Balance at	54,117
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at	68,719
Foreign currency translation	861
Balance at	$ 69,580

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 116,778	$ 116,339
Total acquired intangible assets, Gross Carrying Amount	161,937	161,446
Accumulated Amortization, Finite-lived intangible assets	57,878	55,678
Total acquired intangible assets, Accumulated Amortization	57,878	55,678
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,848	5,876
Accumulated Amortization, Finite-lived intangible assets	3,166	3,062
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	28,107	28,107
Accumulated Amortization, Finite-lived intangible assets	12,490	12,033
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	81,174	80,707
Accumulated Amortization, Finite-lived intangible assets	41,215	39,652
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	$ 1,007	931
Backlog
Finite-Lived Intangible Assets [Line Items]
Estimated Life	3 months
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	$ 45,159	45,107
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0
Minimum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 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
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,139	$ 2,162
2018	6,087
2019	7,654
2020	7,142
2021	6,539
2022	6,127
2023	$ 5,588

Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2013
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ (2,183)	$ (2,379)
Total debt	(210,217)	(210,021)
Less current maturities	400	400
Total long-term debt	209,817	209,621
Senior Subordinated 6.25% Notes
Debt Instrument [Line Items]
Total debt	$ (210,000)	$ (210,000)
Senior Subordinated Notes, interest rate	6.25%	6.25%	6.25%
Other debt
Debt Instrument [Line Items]
Total debt	$ (2,400)	$ (2,400)

Long-Term Debt (Narrative) (Details) - USD ($)	Dec. 09, 2015	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2013	Jan. 31, 2013
Senior Subordinated 6.25% Notes
Debt Instrument [Line Items]
Debt instrument, issued value					$ 210,000,000
Senior Subordinated Notes, interest rate		6.25%	6.25%	6.25%
Revolving Credit Facility \| Senior Credit Agreement
Debt Instrument [Line Items]
Revolving credit facility, availability amount		$ 290,300,000
Borrowings outstanding		0	$ 0
Standby Letters of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Letters of credit issued		9,666,000
Secured Debt \| Senior Credit Agreement
Debt Instrument [Line Items]
Debt instrument, issued value		$ 300,000,000
Line of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Letters of credit issued	$ 500,000,000
Medium-term Notes \| Senior Credit Agreement
Debt Instrument [Line Items]
Debt instrument, issued value	$ 200,000,000
Minimum \| Line of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.20%
Maximum \| Line of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
LIBOR \| Minimum \| Line of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
LIBOR \| Maximum \| Line of Credit \| Senior Credit Agreement
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (5,336)
Accumulated other comprehensive income, tax, beginning balance	(970)
Accumulated Other Comprehensive Income Beginning Balance	(4,366)
Cumulative effect of new accounting principle in period of adoption			$ 274
Other comprehensive income (loss), net of tax	(213)	$ 705
AOCI before tax, ending balance	(5,539)
Accumulated other comprehensive income, tax, ending balance	(960)
Accumulated Other Comprehensive Income Ending Balance	(4,579)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,698)
Other comprehensive income adjustments	110
Other comprehensive income (loss), net of tax	110
AOCI before tax, ending balance	(2,588)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	37
Other comprehensive income (loss), tax	10
Other comprehensive income (loss), net of tax	27
Minimum Pension Liability Adjustment \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	171
Other comprehensive income adjustments	(7)
AOCI before tax, ending balance	179
Postretirement Health Coverage \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,809)
Other comprehensive income adjustments	44
AOCI before tax, ending balance	$ (3,130)
Accounting Standards Update 2014-09
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			(350)
Accounting Standards Update 2014-09 \| Minimum Pension Liability Adjustment \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			15
Accounting Standards Update 2014-09 \| Postretirement Health Coverage \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			$ (365)

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	132,288	98,482
Weighted average grant date fair value (in USD per share)	$ 33.35	$ 43.05
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	67,055	59,112
Weighted average grant date fair value (in USD per share)	$ 33.35	$ 43.05
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	0	20,000
Weighted average grant date fair value (in USD per share)	$ 0.00	$ 43.05

Equity-Based Compensation (Equity Based Awards - Settled in Stock) (Details) - Performance stock units - shares	1 Months Ended		3 Months Ended
	Feb. 29, 2020	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units awarded (in shares)			132,288	98,482
Performance period			1 year
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units awarded that will convert to shares (in shares)		78,482
Shares to be issued on conversion as percentage of total award		30.00%
Units awarded (in shares)		20,000
Performance period		3 years
Scenario, Forecast [Member] \| 2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion (in shares)	23,546

Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 31.8
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Typical vesting period, in years	3 years
Performance period	1 year
PSUs earned	256,000	128,000
Percentage of target performance stock units earned		200.00%	200.00%
Aggregate shares earned (in shares)			438,000
Targeted award (in shares)			219,000
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 19.7

Equity-Based Compensation (Schedule of Compensation Expense Recognized from Change in Fair Value and Vesting of Performance Stock Units) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs compensation expense	$ 706	$ 1,737

Equity-Based Compensation (Management Stock Purchase Plan) (Details) - Management Stock Purchase Plan - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based liabilities paid (in thousands)	$ 4,717,000	$ 2,353,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units credited	$ 63,937	$ 98,770

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair value of outstanding debt	$ 214,000	$ 213,800
Carrying value of outstanding debt	210,217	210,021
Senior Subordinated 6.25% Notes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Carrying value of outstanding debt	$ 210,000	$ 210,000
Senior Subordinated Notes, interest rate	6.25%	6.25%	6.25%

Exit Activity Costs and Asset Impairments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017 facility
Restructuring and Related Activities [Abstract]
Number of facilities closed	3

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries, net	$ (727)	$ (917)
Exit activity costs, net	256	3,919
Total exit activity costs & asset impairments	(471)	3,002
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries, net	(43)	(21)
Exit activity costs, net	(123)	185
Total exit activity costs & asset impairments	(166)	164
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries, net	(703)	(896)
Exit activity costs, net	218	2,656
Total exit activity costs & asset impairments	(485)	1,760
Renewable Energy & Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries, net	19	0
Exit activity costs, net	117	1,050
Total exit activity costs & asset impairments	136	1,050
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries, net	0	0
Exit activity costs, net	44	28
Total exit activity costs & asset impairments	$ 44	$ 28

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	$ 256	$ 3,919
Restructuring Charges	(471)	3,002
Cost of sales
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	37	994
Selling, general, and administrative (recoveries) expense
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	$ (508)	$ 2,008

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
	Mar. 31, 2018	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Exit activity costs, net	$ 256	$ 3,919
Restructuring Reserve [Roll Forward]
Beginning balance	961	3,744
Cash payments	(739)	(4,617)
Ending balance	$ 478	$ 3,046

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 2,807	$ 2,053
Effective tax rate	25.20%	33.90%

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax losses	$ 11,159	$ 6,049
Change in tax rate effect on deferred tax liability			$ 16,200
Transition tax			3,700
Increase in global tax rate	0.60%
Accumulated other comprehensive loss	$ (4,579)		(4,366)
Retained earnings	283,538		$ 274,562	$ 274,836
Accounting Standards Update 2018-02
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss	(350)
Retained earnings	350
Europe \| Solar Racking Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax losses	$ 900

Income Taxes - Schedule of Provisional Income Tax Adjustments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Income Tax Disclosure [Abstract]
Remeasurement of certain deferred tax balances	$ (114)
One-time transition tax	(233)
Non-deductible performance based compensation	51
Net benefit recorded to provisional income tax expense	$ (68)

Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended
Earnings per Share (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 8,352	$ 3,996
Weighted average basic shares outstanding (in shares)	31,786,000	31,688,000
Common stock options and restricted stock (in shares)	658,000	566,000
Weighted average shares outstanding, diluted (in shares)	32,444,000	32,254,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	359,000	526,000

Segment Information (Details) $ in Thousands	3 Months Ended
Segment Information (Details) $ in Thousands	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments \| segment	3
Net sales:	$ 215,337	$ 206,605
Income from operations:	48,318	49,255
Unallocated Corporate Expenses	(6,059)	(9,265)
Total income from operations	13,843	9,679
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	103,948	104,551
Income from operations:	13,238	15,641
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	54,624	50,718
Income from operations:	2,602	(37)
Renewable Energy & Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	56,986	51,792
Income from operations:	4,062	3,340
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(221)	(456)
Intersegment Elimination \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 54,403	$ 50,262

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales:	$ 215,337	$ 206,605
Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	56,986	51,792
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	54,624	50,718
Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	103,948	104,551
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Net sales:	(221)	(456)
Intersegment Elimination \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	54,403	50,262
Point in Time
Disaggregation of Revenue [Line Items]
Net sales:	155,047	160,606
Point in Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	5,620	5,793
Point in Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	102,884	104,551
Point in Time \| Intersegment Elimination \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	46,543	50,262
Over Time
Disaggregation of Revenue [Line Items]
Net sales:	60,290	45,999
Over Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	51,366	45,999
Over Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	1,064	0
Over Time \| Intersegment Elimination \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	$ 7,860	$ 0

Supplemental Financial Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2013
Schedule Of Supplemental Financial Information [Line Items]
Ownership percentage	100.00%
Senior Subordinated 6.25% Notes
Schedule Of Supplemental Financial Information [Line Items]
Senior Subordinated Notes, interest rate	6.25%	6.25%	6.25%

Supplemental Financial Information (Schedule of Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net Sales	$ 215,337	$ 206,605
Cost of sales	167,019	157,350
Gross profit	48,318	49,255
Selling, general, and administrative expense	34,475	39,576
Income from operations	13,843	9,679
Interest expense	3,269	3,576
Other (income) expense	(585)	54
Income before taxes	11,159	6,049
Provision for income taxes	2,807	2,053
Income from continuing operations	8,352	3,996
Equity in earnings from subsidiaries	0	0
Net income	8,352	3,996
Reportable Legal Entities \| Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net Sales	204,467	197,748
Cost of sales	158,584	150,507
Gross profit	45,883	47,241
Selling, general, and administrative expense	32,724	36,506
Income from operations	13,159	10,735
Interest expense	(84)	192
Other (income) expense	28	130
Income before taxes	13,215	10,413
Provision for income taxes	3,335	3,378
Equity in earnings from subsidiaries	1,090	(692)
Net income	10,970	6,343
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net Sales	12,330	11,242
Cost of sales	9,758	8,982
Gross profit	2,572	2,260
Selling, general, and administrative expense	1,707	3,027
Income from operations	865	(767)
Interest expense	(49)	(18)
Other (income) expense	(613)	(76)
Income before taxes	1,527	(673)
Provision for income taxes	437	19
Equity in earnings from subsidiaries	0	0
Net income	1,090	(692)
Reportable Legal Entities \| Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net Sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general, and administrative expense	44	43
Income from operations	(44)	(43)
Interest expense	3,402	3,402
Other (income) expense	0	0
Income before taxes	(3,446)	(3,445)
Provision for income taxes	(965)	(1,344)
Equity in earnings from subsidiaries	10,970	6,343
Net income	8,489	4,242
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net Sales	(1,460)	(2,385)
Cost of sales	(1,323)	(2,139)
Gross profit	(137)	(246)
Selling, general, and administrative expense	0	0
Income from operations	(137)	(246)
Interest expense	0	0
Other (income) expense	0	0
Income before taxes	(137)	(246)
Provision for income taxes	0	0
Equity in earnings from subsidiaries	(12,060)	(5,651)
Net income	$ (12,197)	$ (5,897)

Supplemental Financial Information (Schedule of Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net income	$ 8,352	$ 3,996
Other comprehensive income (loss):
Foreign currency translation adjustment	110	679
Cumulative effect of new accounting principle in period of adoption			$ 274
Adjustment to retirement benefit liability, net of tax	(5)	(3)
Adjustment to post employment health care benefit liability, net of tax	32	29
Other comprehensive income (loss)	(213)	705
Total comprehensive income	8,139	4,701
Guarantor Subsidiaries
Other comprehensive income (loss):
Foreign currency translation adjustment	0
Adjustment to retirement benefit liability, net of tax	(5)
Adjustment to post employment health care benefit liability, net of tax	32
Other comprehensive income (loss)	(323)
Total comprehensive income	10,647
Non-Guarantor Subsidiaries
Other comprehensive income (loss):
Foreign currency translation adjustment	110
Adjustment to retirement benefit liability, net of tax	0
Adjustment to post employment health care benefit liability, net of tax	0
Other comprehensive income (loss)	110
Total comprehensive income	1,200
Gibraltar Industries, Inc.
Other comprehensive income (loss):
Foreign currency translation adjustment	0
Adjustment to retirement benefit liability, net of tax	0
Adjustment to post employment health care benefit liability, net of tax	0
Other comprehensive income (loss)	0
Total comprehensive income	8,489
Reportable Legal Entities \| Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net income	10,970	6,343
Other comprehensive income (loss):
Foreign currency translation adjustment		0
Adjustment to retirement benefit liability, net of tax		(3)
Adjustment to post employment health care benefit liability, net of tax		29
Other comprehensive income (loss)		26
Total comprehensive income		6,369
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net income	1,090	(692)
Other comprehensive income (loss):
Foreign currency translation adjustment		679
Adjustment to retirement benefit liability, net of tax		0
Adjustment to post employment health care benefit liability, net of tax		0
Other comprehensive income (loss)		679
Total comprehensive income		(13)
Reportable Legal Entities \| Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net income	8,489	4,242
Other comprehensive income (loss):
Foreign currency translation adjustment		0
Adjustment to retirement benefit liability, net of tax		0
Adjustment to post employment health care benefit liability, net of tax		0
Other comprehensive income (loss)		0
Total comprehensive income		4,242
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net income	(12,197)	(5,897)
Other comprehensive income (loss):
Foreign currency translation adjustment	0	0
Adjustment to retirement benefit liability, net of tax	0	0
Adjustment to post employment health care benefit liability, net of tax	0	0
Other comprehensive income (loss)	0	0
Total comprehensive income	$ (12,197)	$ (5,897)
Accounting Standards Update 2014-09
Other comprehensive income (loss):
Cumulative effect of new accounting principle in period of adoption			(350)
Accounting Standards Update 2014-09 \| Guarantor Subsidiaries
Other comprehensive income (loss):
Cumulative effect of new accounting principle in period of adoption			$ (350)

Supplemental Financial Information (Schedule of Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	$ 200,741		$ 222,280	$ 160,901	$ 170,177
Accounts receivable, net	145,182	$ 150,307	145,385
Intercompany balances	0		0
Inventories	90,236	81,637	86,372
Other current assets	6,712		8,727
Total current assets	442,871	462,951	462,764
Property, plant, and equipment, net	93,671		97,098
Goodwill	321,772		321,074
Acquired intangibles	104,059		105,768
Other assets	4,770		4,681
Investment in subsidiaries	0		0
Total assets	967,143	991,572	991,385
Accounts payable	80,691		82,387
Accrued expenses	53,254	75,380	75,467
Billings in excess of cost	11,572		12,779
Current maturities of long-term debt	400		400
Total current liabilities	145,917	170,946	171,033
Long-term debt	209,817		209,621
Deferred income taxes	31,339		31,237
Other non-current liabilities	38,115		47,775
Total shareholders’ equity	541,955	531,993	531,719
Total liabilities and shareholders' equity	967,143	$ 991,572	991,385
Reportable Legal Entities \| Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	172,930		192,604	138,763	143,826
Accounts receivable, net	139,143		138,903
Intercompany balances	3,362		4,166
Inventories	86,265		82,457
Other current assets	2,114		(368)
Total current assets	403,814		417,762
Property, plant, and equipment, net	90,625		93,906
Goodwill	298,258		298,258
Acquired intangibles	95,275		97,171
Other assets	4,770		4,681
Investment in subsidiaries	62,594		61,746
Total assets	955,336		973,524
Accounts payable	76,994		77,786
Accrued expenses	49,631		67,746
Billings in excess of cost	9,280		9,840
Current maturities of long-term debt	400		400
Total current liabilities	136,305		155,772
Long-term debt	1,175		1,100
Deferred income taxes	28,918		28,907
Other non-current liabilities	38,115		47,775
Total shareholders’ equity	750,823		739,970
Total liabilities and shareholders' equity	955,336		973,524
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	27,811		29,676	22,138	26,351
Accounts receivable, net	6,039		6,482
Intercompany balances	(4,276)		(4,490)
Inventories	3,971		3,915
Other current assets	3,550		3,680
Total current assets	37,095		39,263
Property, plant, and equipment, net	3,046		3,192
Goodwill	23,514		22,816
Acquired intangibles	8,784		8,597
Other assets	0		0
Investment in subsidiaries	0		0
Total assets	72,439		73,868
Accounts payable	3,697		4,601
Accrued expenses	1,435		2,252
Billings in excess of cost	2,292		2,939
Current maturities of long-term debt	0		0
Total current liabilities	7,424		9,792
Long-term debt	0		0
Deferred income taxes	2,421		2,330
Other non-current liabilities	0		0
Total shareholders’ equity	62,594		61,746
Total liabilities and shareholders' equity	72,439		73,868
Reportable Legal Entities \| Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	0		0	0	0
Accounts receivable, net	0		0
Intercompany balances	914		324
Inventories	0		0
Other current assets	1,048		5,415
Total current assets	1,962		5,739
Property, plant, and equipment, net	0		0
Goodwill	0		0
Acquired intangibles	0		0
Other assets	0		0
Investment in subsidiaries	750,823		739,970
Total assets	752,785		745,709
Accounts payable	0		0
Accrued expenses	2,188		5,469
Billings in excess of cost	0		0
Current maturities of long-term debt	0		0
Total current liabilities	2,188		5,469
Long-term debt	208,642		208,521
Deferred income taxes	0		0
Other non-current liabilities	0		0
Total shareholders’ equity	541,955		531,719
Total liabilities and shareholders' equity	752,785		745,709
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	0		0	$ 0	$ 0
Accounts receivable, net	0		0
Intercompany balances	0		0
Inventories	0		0
Other current assets	0		0
Total current assets	0		0
Property, plant, and equipment, net	0		0
Goodwill	0		0
Acquired intangibles	0		0
Other assets	0		0
Investment in subsidiaries	(813,417)		(801,716)
Total assets	(813,417)		(801,716)
Accounts payable	0		0
Accrued expenses	0		0
Billings in excess of cost			0
Current maturities of long-term debt	0		0
Total current liabilities	0		0
Long-term debt	0		0
Deferred income taxes	0		0
Other non-current liabilities	0		0
Total shareholders’ equity	(813,417)		(801,716)
Total liabilities and shareholders' equity	$ (813,417)		$ (801,716)

Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	$ (22,206)	$ 2,343
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired	0	(18,561)
Net proceeds from sale of property and equipment	2,823	9,233
Purchases of property, plant, and equipment	(1,033)	(1,453)
Net cash provided by (used in) investing activities	1,790	(10,781)
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(850)	(922)
Net proceeds from issuance of common stock	226	11
Intercompany financing	0	0
Net cash used in financing activities	(624)	(911)
Effect of exchange rate changes on cash	(499)	73
Net decrease in cash and cash equivalents	(21,539)	(9,276)
Cash and cash equivalents at beginning of year	222,280
Cash and cash equivalents at end of period	200,741
Reportable Legal Entities \| Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	(14,829)	12,141
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		(18,561)
Net proceeds from sale of property and equipment	2,823	9,081
Purchases of property, plant, and equipment	(1,008)	(1,326)
Net cash provided by (used in) investing activities	1,815	(10,806)
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	0	0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(6,660)	(6,398)
Net cash used in financing activities	(6,660)	(6,398)
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	(19,674)	(5,063)
Cash and cash equivalents at beginning of year	192,604
Cash and cash equivalents at end of period	172,930
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	(771)	(3,193)
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		0
Net proceeds from sale of property and equipment	0	152
Purchases of property, plant, and equipment	(25)	(127)
Net cash provided by (used in) investing activities	(25)	25
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	0	0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(570)	(1,118)
Net cash used in financing activities	(570)	(1,118)
Effect of exchange rate changes on cash	(499)	73
Net decrease in cash and cash equivalents	(1,865)	(4,213)
Cash and cash equivalents at beginning of year	29,676
Cash and cash equivalents at end of period	27,811
Reportable Legal Entities \| Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	(6,606)	(6,605)
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		0
Net proceeds from sale of property and equipment	0	0
Purchases of property, plant, and equipment	0	0
Net cash provided by (used in) investing activities	0	0
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	(850)	(922)
Net proceeds from issuance of common stock	226	11
Intercompany financing	7,230	7,516
Net cash used in financing activities	6,606	6,605
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of year	0
Cash and cash equivalents at end of period	0
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		0
Net proceeds from sale of property and equipment	0	0
Purchases of property, plant, and equipment	0	0
Net cash provided by (used in) investing activities	0	0
Cash Flows from Financing Activities
Purchase of treasury stock at market prices	0	0
Net proceeds from issuance of common stock	0	0
Intercompany financing	0	0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	0	$ 0
Cash and cash equivalents at beginning of year	0
Cash and cash equivalents at end of period	$ 0