Gibraltar Industries (ROCK) 10-Q 26 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	ROCK
Entity Registrant Name	GIBRALTAR INDUSTRIES, INC.
Entity Central Index Key	912,562
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		31,998,477

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales:	$ 266,036	$ 247,627	$ 481,373	$ 454,232
Cost of sales	195,533	185,802	362,552	343,152
Gross profit	70,503	61,825	118,821	111,080
Selling, general, and administrative expense	38,229	36,895	72,704	76,471
Income from operations	32,274	24,930	46,117	34,609
Interest expense	3,130	3,550	6,399	7,126
Other expense (income)	13	353	(572)	407
Income before taxes	29,131	21,027	40,290	27,076
Provision for income taxes	6,294	7,853	9,101	9,906
Income from continuing operations	22,837	13,174	31,189	17,170
Discontinued operations:
Loss before taxes	0	(644)	0	(644)
Benefit of income taxes	0	(239)	0	(239)
Loss from discontinued operations	0	(405)	0	(405)
Net income	$ 22,837	$ 12,769	$ 31,189	$ 16,765
Net earnings per share – Basic:
Income from continuing operations - Net earnings per share - Basic (in USD per share)	$ 0.72	$ 0.41	$ 0.98	$ 0.54
Income from discontinued operations - Net earnings per share - Basic (in USD per share)	0	(0.01)	0	(0.01)
Net earnings per share - Basic (in USD per share)	0.72	0.40	0.98	0.53
Net earnings per share - Diluted
Income from continuing operations - Net earnings per share - Diluted (in USD per share)	0.70	0.41	0.96	0.53
Income from discontinued operations - Net earnings per share - Diluted (in USD per share)	0	(0.01)	0	(0.01)
Net earnings per share - Diluted (in USD per share)	$ 0.70	$ 0.40	$ 0.96	$ 0.52
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	31,862	31,709	31,824	31,698
Weighted average shares outstanding, diluted (in shares)	32,553	32,183	32,498	32,219

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 22,837	$ 12,769	$ 31,189	$ 16,765
Other comprehensive (loss) income:
Foreign currency translation adjustment	(1,787)	1,091	(1,677)	1,770
Cumulative effect of accounting change (see Note 2)	0	0	(350)	0
Adjustment to retirement benefit liability, net of tax	(5)	(3)	(10)	(6)
Adjustment to post employment health care benefit liability, net of tax	31	30	63	59
Other comprehensive (loss) income	(1,761)	1,118	(1,974)	1,823
Total comprehensive income	$ 21,076	$ 13,887	$ 29,215	$ 18,588

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 210,743	$ 222,280
Accounts receivable, net	171,642	145,385
Inventories	95,694	86,372
Other current assets	11,594	8,727
Total current assets	489,673	462,764
Property, plant, and equipment, net	93,221	97,098
Goodwill	320,875	321,074
Acquired intangibles	101,554	105,768
Other assets	4,597	4,681
Total assets	1,009,920	991,385
Current liabilities:
Accounts payable	88,547	82,387
Accrued expenses	65,174	75,467
Billings in excess of cost	15,527	12,779
Current maturities of long-term debt	400	400
Total current liabilities	169,648	171,033
Long-term debt	209,613	209,621
Deferred income taxes	31,196	31,237
Other non-current liabilities	38,567	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; 32,755 shares and 32,332 shares issued and outstanding in 2018 and 2017	327	323
Additional paid-in capital	277,307	271,957
Retained earnings	306,375	274,562
Accumulated other comprehensive loss	(6,340)	(4,366)
Cost of 767 and 615 common shares held in treasury in 2018 and 2017	(16,773)	(10,757)
Total shareholders’ equity	560,896	531,719
Total liabilities and shareholders' equity	$ 1,009,920	$ 991,385

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 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	32,755,000	32,332,000
Treasury stock, shares	767,000	615,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net income	$ 31,189	$ 16,765
Loss from discontinued operations	0	(405)
Income from continuing operations	31,189	17,170
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,345	11,006
Stock compensation expense	4,828	3,191
Net gain on sale of assets	(52)	(39)
Exit activity recoveries, non-cash	(662)	(2,737)
Other, net	709	628
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(22,048)	(14,446)
Inventories	(14,985)	2,245
Other current assets and other assets	(2,840)	(2,174)
Accounts payable	6,064	16,962
Accrued expenses and other non-current liabilities	(16,351)	(10,086)
Net cash (used in) provided by operating activities of continuing operations	(3,803)	21,720
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired	0	(18,494)
Net proceeds from sale of property and equipment	2,929	12,778
Purchases of property, plant, and equipment	(3,704)	(3,274)
Net cash used in investing activities	(775)	(8,990)
Cash Flows from Financing Activities
Long-term debt payments	(400)	(400)
Purchase of treasury stock at market prices	(6,016)	(1,003)
Net proceeds from issuance of common stock	526	247
Net cash used in financing activities	(5,890)	(1,156)
Effect of exchange rate changes on cash	(1,069)	628
Net (decrease) increase in cash and cash equivalents	(11,537)	12,202
Cash and cash equivalents at beginning of year	222,280	170,177
Cash and cash equivalents at end of period	$ 210,743	$ 182,379

Consolidated Statement of Share

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
Net income	31,189
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	31,189
Foreign currency translation adjustment	(1,677)				(1,677)
Adjustment to retirement benefit liability, net of taxes of $(4)	(10)				(10)
Adjustment to post employment health care benefit liability, net of taxes of $25	63				63
Stock compensation expense	4,828		4,828
Stock options exercised, shares		34
Stock options exercised	526	$ 0	526
Issuance of restricted stock (in shares)		2
Issuance of restricted stock	0	$ 0	0
Net settlement of restricted stock units, shares		387				152
Net settlement of restricted stock units	(6,016)	$ 4	(4)			$ (6,016)
Balance, shares at Jun. 30, 2018		32,755				767
Balance, value at Jun. 30, 2018	$ 560,896	$ 327	$ 277,307	$ 306,375	(6,340)	$ (16,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					$ (350)

Consolidated Statement of Shar8

Consolidated Statement of Shareholders' Equity (Parenthetical) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Statement of Stockholders' Equity [Abstract]
Adjustment to pension benefit liability, taxes	$ (4)
Adjustment to post-retirement health care benefit liability, taxes	$ (25)

Consolidated Financial Statemen

Consolidated Financial Statements	6 Months Ended
	Jun. 30, 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 Pronouncement

Recent Accounting Pronouncements (Notes)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	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. The Company does not expect a material impact to our consolidated statement of operations as a result of the adoption. Planned date of adoption: Q1 2019

Accounts Receivable

Accounts Receivable	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE, NET Accounts receivable consists of the following (in thousands): June 30, 2018 December 31, 2017 Trade accounts receivable $ 157,944 $ 140,209 Costs in excess of billings 20,163 11,610 Total accounts receivables 178,107 151,819 Less allowance for doubtful accounts (6,465 ) (6,434 ) Accounts receivable $ 171,642 $ 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.

Revenue Revenue

Revenue Revenue	6 Months Ended
	Jun. 30, 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, which is generally the quoted price per terms of the contract and the consideration the Company excepts to receive, to each performance obligation in an amount based on an observable price of the products as the Company frequently sells these products separately in similar circumstances and to similar customers. These products are generally sold with rights of return and these contracts may provide other credits or incentives, which are accounted for as variable consideration. Variable consideration is estimated at the most likely amount to predict the consideration to which the Company will be entitled, and only to the extent it is probable that a subsequent change in estimate will not result in a significant revenue reversal when estimating the amount of revenue to recognize. Sales returns, allowances, and customer incentives, including rebates, are treated as reductions to the sales transaction price and based largely on an assessment of all information (i.e., historical, current and forecasted) that is reasonably available to the Company, and estimated at contract inception and updated at the end of each reporting period as additional information becomes available. Performance obligations satisfied over time and significant judgments For 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. For the contracts for products that have no alternative use and for which the Company has enforceable right to payment, the Company identifies these products as products that are not a standard inventory item or the Company cannot readily direct the product to another customer 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 determines the transaction price for each contract based on the consideration the Company expects to receive for the promised products and services under the entire contract, which is generally the stated contract price based on an expected cost plus a margin approach. When the promised products do not have an alternative use to the Company, and the Company has enforceable rights to payment, the transaction price is determined for each contract based on the consideration the Company expects to receive for the promised products under the contract and is generally the stated contract price based on an expected cost plus a margin approach for each performance obligation. These promised products are generally capable of being distinct and accounted for as separate performance obligations. For the above contracts with customers with respect to which the Company satisfies a performance obligation over time, the Company recognizes revenue based on the extent of progress towards completion of the performance obligation. The cost-to-cost measure of progress best depicts the transfer of control to the customer which occurs as the Company incurs costs on the contract as the incurred costs are proportionate to the Company's progress in satisfying the performance obligation. Under the cost-to-cost measure of progress, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Revenues are recognized proportionally as costs are incurred. Costs to fulfill a contract include all direct costs related to contract performance. Selling and administrative expenses are charged to operations as incurred. Provision for loss on an uncompleted performance obligation is recognized in the period in which such loss is determined. The Company regularly reviews the progress and performance of the performance obligation recognized over time under the cost-to-cost method. Any adjustments to net sales, cost of sales, and the related impact to operating income are recognized as necessary in the period they become known. Changes in estimates of net sales, cost of sales, and the related impact to operating income are recognized on a cumulative catch-up basis, which recognizes in the current period the cumulative effect of the changes on current or prior periods based on a performance obligation's cost-to-cost measure of progress. The Company also recognizes revenues from services contracts over time. For these contracts, the transaction price is determined for each contract based on the consideration the Company expects to receive for the promised service under the contract, which generally is the stated contract price. In order to estimate the standalone selling price of the performance obligation, the Company evaluates the market in which the promised service is sold and estimates the price that customers in the market would be willing to pay. Further, the Company recognizes revenue over time during the term of the agreement as the customer is simultaneously receiving and consuming the benefits provided throughout the Company's performance. Therefore due to control transferring over time, the Company recognizes revenue on a straight-line basis throughout the contract period. Remaining performance obligations As of June 30, 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. Contract assets Contract assets consist of 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 net of contract billings on a contract-by-contract basis at the end of each reporting period. Contract liabilities Contract liabilities consist of 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 net of contract cost on a contract-by-contract basis at the end of each reporting period and are classified as current liabilities. To determine the revenue recognized in the period from the beginning balance of billings in excess of cost, the contract liability as of the beginning of the period is recognized as revenue on a contract by contract basis when the Company incurs costs to satisfy the performance obligation related to the individual contract. Once the beginning contract liability balance for an individual contract has been fully recognized as revenue, any additional payments received in the period are recognized as revenue once the related costs have been incurred. 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 June 30, 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 June 30, 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 (14,950 ) — Billings in excess of cost to revenue — 9,044 Costs in excess of billings recognized, net of reclassification to receivables 18,581 — Net billings in advance and cash payments not recognized as revenue — (11,792 ) Ending balance, June 30, 2018 $ 20,163 $ (15,527 ) (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 for 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 upon transfer of title and risk of loss, 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 six months ended June 30, 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 June 30, 2018 is as follows (in thousands): Consolidated Statement of Operations Three Months Ended June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Net sales $ 266,036 $ 265,752 $ 284 Cost of sales 195,533 195,581 (48 ) Gross profit 70,503 70,171 332 Provision for income taxes 6,294 6,201 93 Net income $ 22,837 $ 22,598 $ 239 Consolidated Statement of Operations Six Months Ended June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Net sales $ 481,373 $ 479,121 $ 2,252 Cost of sales 362,552 361,161 1,391 Gross profit 118,821 117,960 861 Provision for income taxes 9,101 8,859 242 Net income $ 31,189 $ 30,570 $ 619 Consolidated Balance Sheet June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Assets Accounts receivable, net $ 171,642 $ 164,359 $ 7,283 Inventories 95,694 101,915 (6,221 ) Total current assets 489,673 488,611 1,062 Total assets 1,009,920 1,008,858 1,062 Liabilities Accrued expenses 65,174 65,005 169 Total current liabilities 169,648 169,479 169 Shareholders' equity Retained earnings 306,375 305,482 893 Total shareholders' equity 560,896 560,003 893 Total liabilities and shareholders' equity $ 1,009,920 $ 1,008,858 $ 1,062

Inventories

Inventories	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories consist of the following (in thousands): June 30, 2018 December 31, 2017 Raw material $ 52,835 $ 42,661 Work-in-process 7,640 10,598 Finished goods 35,219 33,113 Total inventories $ 95,694 $ 86,372

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
ACQUISITIONS	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 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 $13 thousand and $115 thousand for the three and six months ended June 30 , 2017, respectively.

Goodwill and Related Intangible

Goodwill and Related Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND RELATED INTANGIBLE ASSETS	GOODWILL AND RELATED INTANGIBLE ASSETS Goodwill The changes in the carrying amount of goodwill for the six months ended June 30, 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 — (269 ) 70 (199 ) Balance at June 30, 2018 $ 198,075 $ 54,011 $ 68,789 $ 320,875 Acquired Intangible Assets Acquired intangible assets consist of the following (in thousands): June 30, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Estimated Life Indefinite-lived intangible assets: Trademarks $ 45,117 $ — $ 45,107 $ — Indefinite Finite-lived intangible assets: Trademarks 5,830 3,273 5,876 3,062 5 to 15 Years Unpatented technology 28,107 12,948 28,107 12,033 5 to 20 Years Customer relationships 80,725 42,571 80,707 39,652 5 to 17 Years Non-compete agreements 1,649 1,082 1,649 931 4 to 10 Years 116,311 59,874 116,339 55,678 Total acquired intangible assets $ 161,428 $ 59,874 $ 161,446 $ 55,678 The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Amortization expense $ 2,148 $ 2,230 $ 4,287 $ 4,392 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 $ 4,048 $ 7,653 $ 7,141 $ 6,538 $ 6,126 $ 5,587

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Long-term debt consists of the following (in thousands): June 30, 2018 December 31, 2017 Senior Subordinated 6.25% Notes $ 210,000 $ 210,000 Other debt 2,000 2,400 Less unamortized debt issuance costs (1,987 ) (2,379 ) Total debt 210,013 210,021 Less current maturities 400 400 Total long-term debt $ 209,613 $ 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 June 30, 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 June 30, 2018 . These letters of credit reduce the amount otherwise available under the revolving credit facility. As of June 30, 2018 , the Company had $290.3 million of availability under the revolving credit facility. No borrowings were outstanding under the revolving credit facility at June 30, 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

Accumulated Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME The cumulative balance of each component of accumulated other comprehensive loss, net of tax, is as follows (in thousands): Foreign Currency Translation Adjustment Minimum Pension Unamortized Post Retirement Health Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other 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 — (14 ) 88 74 21 53 Foreign currency translation adjustment (1,677 ) — — (1,677 ) — (1,677 ) Balance at June 30, 2018 $ (4,375 ) $ 172 $ (3,086 ) $ (7,289 ) $ (949 ) $ (6,340 ) 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

Equity-Based Compensation	6 Months Ended
	Jun. 30, 2018
Share-based Compensation [Abstract]
EQUITY-BASED COMPENSATION	EQUITY-BASED COMPENSATION On May 4, 2018, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Plan"). The 2018 Plan provides for the issuance of up to 1,000,000 shares of common stock and supplements the remaining shares available for issuance under the existing Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "2015 Plan"). Both the 2018 Plan and the 2015 Plan allow the Company to grant equity-based incentive compensation awards, in the form of non-qualified options, restricted shares, restricted stock units, performance shares, performance stock units, and stock rights, to eligible participants. In 2016, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2016 Stock Plan for Non-Employee Directors ("Non-Employee Directors Plan") which allows the Company to grant awards of shares of the Company's common stock to non-employee Directors of the Company and permits the Directors to defer receipt of such shares pursuant to the terms of the Non-Employee Directors Plan. Equity Based Awards - Settled in Stock The following table sets forth the number of equity-based awards granted during the six months ended June 30, 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 $ 33.35 108,748 $ 42.72 Restricted stock units 69,055 $ 33.41 74,292 $ 42.39 Options — $ — 25,000 $ 42.35 Deferred stock units 10,255 $ 35.96 10,170 $ 34.42 Common shares 2,113 $ 35.50 2,034 $ 34.42 (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 June 30, 2018 , the Company's total share-based liabilities recorded on the consolidated balance sheet were $34.5 million , of which $21.3 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 and six months ended June 30, (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 PSUs compensation expense $ 902 $ 341 $ 1,608 $ 2,078 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 deferral. 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 six months ended June 30, 2018 2017 Restricted stock units credited 69,514 88,344 Share-based liabilities paid (in thousands) $ 4,717 $ 2,353

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, various techniques and assumptions can be used to estimate fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement as follows: • Level 1 - Quoted prices in active markets for identical assets or liabilities. • Level 2 - Observable inputs other than quoted prices in active markets for similar assets and liabilities. • Level 3 - Inputs that are unobservable inputs for the asset or liability. The Company had no financial assets or liabilities measured at fair value on a recurring basis at June 30, 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 June 30, 2018 and December 31, 2017 , the fair value of outstanding debt net of unamortized debt issuance costs was $211.8 million and $213.8 million, respectively, compared to its carrying value of $210.0 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.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS For certain divestiture transactions completed in prior years, the Company has agreed to indemnify the buyer for various liabilities that may arise after the disposal date, subject to limits of time and amount. The Company is a party to certain claims made under these indemnification provisions. As of June 30, 2018 , the Company has a contingent liability recorded for such provisions related to discontinued operations. Management does not believe that the outcome of these claims, or other claims, would significantly affect the Company's financial condition or results of operation.

Exit Activity Costs and Asset I

Exit Activity Costs and Asset Impairments	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS	EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS The Company has incurred exit activity costs and asset impairment charges as a result of its 80/20 simplification and portfolio management initiatives. These initiatives have resulted in the identification of low-volume, low margin, internally-produced products which have been or will be outsourced or discontinued, and in the sale and exiting of less profitable businesses or products lines. Exit activity costs were incurred during the six months ended June 30, 2018 which related to contract terminations, severance, and other moving and closing costs. The Company closed 1 facility during the first half of 2018 as a result of these initiatives. 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 six months ended June 30, 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 half of 2017 . The following tables set forth the asset impairment charges and exit activity costs incurred by segment during the three and six months ended June 30, related to the restructuring activities described above (in thousands): Three months ended June 30, 2018 2017 Inventory write-downs &/or asset impairment charges Exit activity (recoveries) costs, net Total Inventory write-downs &/or asset impairment recoveries Exit activity costs Total Residential Products $ — $ (29 ) $ (29 ) $ (126 ) $ 207 $ 81 Industrial & Infrastructure Products — (28 ) (28 ) (1,694 ) 315 (1,379 ) Renewable Energy & Conservation 65 (68 ) (3 ) — 1,369 1,369 Corporate — 223 223 — 135 135 Total exit activity costs & asset impairments $ 65 $ 98 $ 163 $ (1,820 ) $ 2,026 $ 206 Six months ended June 30, 2018 2017 Inventory write-downs &/or asset impairment (recoveries) charges, net Exit activity (recoveries) costs, net Total Inventory write-downs &/or asset impairment recoveries Exit activity costs Total Residential Products $ (43 ) $ (152 ) $ (195 ) $ (147 ) $ 392 $ 245 Industrial & Infrastructure Products (703 ) 190 (513 ) (2,590 ) 2,971 381 Renewable Energy & Conservation 84 49 133 — 2,419 2,419 Corporate — 267 267 — 163 163 Total exit activity costs & asset impairments $ (662 ) $ 354 $ (308 ) $ (2,737 ) $ 5,945 $ 3,208 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 and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Cost of sales $ (193 ) $ (1,472 ) $ (156 ) $ (478 ) Selling, general, and administrative expense (recoveries) 356 1,678 (152 ) 3,686 Net asset impairment and exit activity charges (recoveries) $ 163 $ 206 $ (308 ) $ 3,208 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 354 5,945 Cash payments (1,256 ) (8,288 ) Balance at June 30 $ 59 $ 1,401

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three and six months ended June 30, and the applicable effective tax rates: Three Months Ended Six Months Ended 2018 2017 2018 2017 Provision for income taxes $ 6,294 $ 7,853 $ 9,101 $ 9,906 Effective tax rate 21.6 % 37.3 % 22.6 % 36.6 % The change in the effective tax rate year over year is primarily due to the reduction in the U.S. federal statutory tax rate from 35% to 21%. The effective tax rate for the three and six months ended June 30, 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, including a $1.9 million tax benefit related to performance share unit vesting. The effective tax rate for the three and six months ended June 30, 2017 was greater than the U.S. federal statutory rate of 35% due to state taxes and $2.0 million of pretax losses generated by the European residential solar racking business for which no tax benefit had been recorded as such benefit is not expected to be realizable, partially offset by net deductible permanent differences and favorable discrete items. 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 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 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 Tax Reform Act may require further adjustments and changes in our estimates. During the six month period ended June 30, 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 six month period ended June 30, 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 global intangible low-taxed income ("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 three and six months ended June 30, 2018 . Based upon our interpretation, the impact of GILTI on our current annual effective tax increased the rate by 0.6% . If future guidance differs from our interpretations, this amount may change. 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 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

Earnings per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings and diluted weighted-average shares outstanding are as follows for the three and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Numerator: Income from continuing operations $ 22,837 $ 13,174 $ 31,189 $ 17,170 Loss from discontinued operations — (405 ) — (405 ) Net income available to common shareholders $ 22,837 $ 12,769 $ 31,189 $ 16,765 Denominator for basic earnings per share: Weighted average shares outstanding 31,862 31,709 31,824 31,698 Denominator for diluted earnings per share: Weighted average shares outstanding 31,862 31,709 31,824 31,698 Common stock options and restricted stock 691 474 674 521 Weighted average shares and conversions 32,553 32,183 32,498 32,219 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 377,000 and 556,000 for the three months ended June 30, 2018 and 2017 , respectively, and 368,000 and 541,000 for the six months ended June 30, 2018 and 2017 , respectively.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2018
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION The Company is organized into three reportable segments on the basis of the production 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 and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Net sales: Residential Products $ 131,128 $ 127,252 $ 235,076 $ 231,803 Industrial and Infrastructure Products 61,561 57,926 116,185 108,644 Less: Intersegment sales (368 ) (314 ) (589 ) (770 ) Net Industrial and Infrastructure Products 61,193 57,612 115,596 107,874 Renewable Energy and Conservation 73,715 62,763 130,701 114,555 Total consolidated net sales $ 266,036 $ 247,627 $ 481,373 $ 454,232 Income from operations: Residential Products $ 24,196 $ 22,579 $ 37,434 $ 38,220 Industrial and Infrastructure Products 6,604 3,397 9,206 3,360 Renewable Energy and Conservation 9,556 3,492 13,618 6,832 Unallocated Corporate Expenses (8,082 ) (4,538 ) (14,141 ) (13,803 ) Total income from operations $ 32,274 $ 24,930 $ 46,117 $ 34,609 The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three and six months ended June 30 (in thousands): Three Months Ended June 30, 2018 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 130,958 $ 51,428 $ 8,724 $ 191,110 Over Time 170 9,765 64,991 74,926 Total $ 131,128 $ 61,193 $ 73,715 $ 266,036 Three Months Ended June 30, 2017 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 127,252 $ 57,612 $ 5,383 $ 190,247 Over Time — — 57,380 57,380 Total $ 127,252 $ 57,612 $ 62,763 $ 247,627 Six Months Ended June 30, 2018 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 233,842 $ 97,971 $ 14,344 $ 346,157 Over Time 1,234 17,625 116,357 135,216 Total $ 235,076 $ 115,596 $ 130,701 $ 481,373 Six Months Ended June 30, 2017 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 231,803 $ 107,874 $ 11,176 $ 350,853 Over Time — — 103,379 103,379 Total $ 231,803 $ 107,874 $ 114,555 $ 454,232

Supplemental Financial Informat

Supplemental Financial Information	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Disclosure [Abstract]
SUPPLEMENTAL FINANCIAL INFORMATION	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 JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 256,487 $ 14,194 $ (4,645 ) $ 266,036 Cost of sales — 189,082 10,891 (4,440 ) 195,533 Gross profit — 67,405 3,303 (205 ) 70,503 Selling, general, and administrative expense 36 36,449 1,744 — 38,229 (Loss) income from operations (36 ) 30,956 1,559 (205 ) 32,274 Interest expense (income) 3,402 (213 ) (59 ) — 3,130 Other expense (income) — 111 (98 ) — 13 (Loss) income before taxes (3,438 ) 31,058 1,716 (205 ) 29,131 (Benefit of) provision for income taxes (962 ) 6,874 382 — 6,294 Equity in earnings from subsidiaries 25,518 1,334 — (26,852 ) — Net income $ 23,042 $ 25,518 $ 1,334 $ (27,057 ) $ 22,837 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 238,652 $ 10,627 $ (1,652 ) $ 247,627 Cost of sales — 178,779 8,739 (1,716 ) 185,802 Gross profit — 59,873 1,888 64 61,825 Selling, general, and administrative expense 34 33,681 3,180 — 36,895 (Loss) income from operations (34 ) 26,192 (1,292 ) 64 24,930 Interest expense (income) 3,403 162 (15 ) — 3,550 Other expense — 115 238 — 353 (Loss) income before taxes (3,437 ) 25,915 (1,515 ) 64 21,027 (Benefit of) provision for income taxes (1,340 ) 9,360 (167 ) — 7,853 (Loss) income from continuing operations (2,097 ) 16,555 (1,348 ) 64 13,174 Discontinued operations: Loss from discontinued operations before taxes — (644 ) — — (644 ) Benefit of income taxes — (239 ) — — (239 ) Loss from discontinued operations — (405 ) — — (405 ) Equity in earnings (loss) from subsidiaries 14,802 (1,348 ) — (13,454 ) — Net income (loss) $ 12,705 $ 14,802 $ (1,348 ) $ (13,390 ) $ 12,769 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS SIX MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 460,954 $ 26,524 $ (6,105 ) $ 481,373 Cost of sales — 347,666 20,649 (5,763 ) 362,552 Gross profit — 113,288 5,875 (342 ) 118,821 Selling, general, and administrative expense 80 69,173 3,451 — 72,704 (Loss) income from operations (80 ) 44,115 2,424 (342 ) 46,117 Interest expense (income) 6,804 (297 ) (108 ) — 6,399 Other expense (income) — 139 (711 ) — (572 ) (Loss) income before taxes (6,884 ) 44,273 3,243 (342 ) 40,290 (Benefit of) provision for income taxes (1,927 ) 10,209 819 — 9,101 Equity in earnings from subsidiaries 36,488 2,424 — (38,912 ) — Net income $ 31,531 $ 36,488 $ 2,424 $ (39,254 ) $ 31,189 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS SIX MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 436,400 $ 21,869 $ (4,037 ) $ 454,232 Cost of sales — 329,286 17,721 (3,855 ) 343,152 Gross profit — 107,114 4,148 (182 ) 111,080 Selling, general, and administrative expense 77 70,187 6,207 — 76,471 (Loss) income from operations (77 ) 36,927 (2,059 ) (182 ) 34,609 Interest expense (income) 6,805 354 (33 ) — 7,126 Other expense — 245 162 — 407 (Loss) income before taxes (6,882 ) 36,328 (2,188 ) (182 ) 27,076 (Benefit of) provision for income taxes (2,684 ) 12,738 (148 ) — 9,906 (Loss) income from continuing operations (4,198 ) 23,590 (2,040 ) (182 ) 17,170 Discontinued operations: Loss from discontinued operations before taxes — (644 ) — — (644 ) Benefit of income taxes — (239 ) — — (239 ) Loss from discontinued operations — (405 ) — — (405 ) Equity in earnings (loss) from subsidiaries 21,145 (2,040 ) — (19,105 ) — Net income (loss) $ 16,947 $ 21,145 $ (2,040 ) $ (19,287 ) $ 16,765 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income $ 23,042 $ 25,518 $ 1,334 $ (27,057 ) $ 22,837 Other comprehensive (loss) income: Foreign currency translation adjustment — — (1,787 ) — (1,787 ) Adjustment to retirement benefit liability, net of tax — (5 ) — — (5 ) Adjustment to post employment health care benefit liability, net of tax — 31 — — 31 Other comprehensive income (loss) — 26 (1,787 ) — (1,761 ) Total comprehensive income (loss) $ 23,042 $ 25,544 $ (453 ) $ (27,057 ) $ 21,076 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income (loss) $ 12,705 $ 14,802 $ (1,348 ) $ (13,390 ) $ 12,769 Other comprehensive income (loss): Foreign currency translation adjustment — — 1,091 — 1,091 Adjustment to retirement benefit liability, net of tax — (3 ) — — (3 ) Adjustment to post employment health care benefit liability, net of tax — 30 — — 30 Other comprehensive income — 27 1,091 — 1,118 Total comprehensive income (loss) $ 12,705 $ 14,829 $ (257 ) $ (13,390 ) $ 13,887 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income $ 31,531 $ 36,488 $ 2,424 $ (39,254 ) $ 31,189 Other comprehensive (loss) income: Foreign currency translation adjustment — — (1,677 ) — (1,677 ) Cumulative effect of change in accounting (see Note 2 ) — (350 ) — — (350 ) Adjustment to retirement benefit liability, net of tax — (10 ) — — (10 ) Adjustment to post employment health care benefit liability, net of tax — 63 — — 63 Other comprehensive loss — (297 ) (1,677 ) — (1,974 ) Total comprehensive income $ 31,531 $ 36,191 $ 747 $ (39,254 ) $ 29,215 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income (loss) $ 16,947 $ 21,145 $ (2,040 ) $ (19,287 ) $ 16,765 Other comprehensive income (loss): Foreign currency translation adjustment — — 1,770 — 1,770 Adjustment to retirement benefit liability, net of tax — (6 ) — — (6 ) Adjustment to post employment health care benefit liability, net of tax — 59 — — 59 Other comprehensive income — 53 1,770 — 1,823 Total comprehensive income (loss) $ 16,947 $ 21,198 $ (270 ) $ (19,287 ) $ 18,588 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING BALANCE SHEETS JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Assets Current assets: Cash and cash equivalents $ — $ 181,879 $ 28,864 $ — $ 210,743 Accounts receivable, net — 164,357 7,285 — 171,642 Intercompany balances (1,220 ) 4,505 (3,285 ) — — Inventories — 91,611 4,083 — 95,694 Other current assets 1,975 5,708 3,911 — 11,594 Total current assets 755 448,060 40,858 — 489,673 Property, plant, and equipment, net — 90,333 2,888 — 93,221 Goodwill — 298,258 22,617 — 320,875 Acquired intangibles — 93,367 8,187 — 101,554 Other assets — 4,597 — — 4,597 Investment in subsidiaries 774,373 62,074 — (836,447 ) — $ 775,128 $ 996,689 $ 74,550 $ (836,447 ) $ 1,009,920 Liabilities and Shareholders’ Equity Current liabilities: Accounts payable $ — $ 84,166 $ 4,381 $ — $ 88,547 Accrued expenses 5,469 56,377 3,328 — 65,174 Billings in excess of cost — 13,028 2,499 15,527 Current maturities of long-term debt — 400 — — 400 Total current liabilities 5,469 153,971 10,208 — 169,648 Long-term debt 208,763 850 — — 209,613 Deferred income taxes — 28,928 2,268 — 31,196 Other non-current liabilities — 38,567 — — 38,567 Shareholders’ equity 560,896 774,373 62,074 (836,447 ) 560,896 $ 775,128 $ 996,689 $ 74,550 $ (836,447 ) $ 1,009,920 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 SIX MONTHS ENDED JUNE 30, 2018 (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 $ (6,643 ) $ 884 $ 1,956 $ — $ (3,803 ) Cash Flows from Investing Activities Net proceeds from sale of property and equipment — 2,864 65 — 2,929 Purchases of property, plant, and equipment — (3,564 ) (140 ) — (3,704 ) Net cash used in investing activities — (700 ) (75 ) — (775 ) Cash Flows from Financing Activities Long-term debt payments — (400 ) — — (400 ) Purchase of treasury stock at market prices (6,016 ) — — — (6,016 ) Net proceeds from issuance of common stock 526 — — — 526 Intercompany financing 12,133 (10,509 ) (1,624 ) — — Net cash provided by (used in) financing activities 6,643 (10,909 ) (1,624 ) — (5,890 ) Effect of exchange rate changes on cash — — (1,069 ) — (1,069 ) Net decrease in cash and cash equivalents — (10,725 ) (812 ) — (11,537 ) Cash and cash equivalents at beginning of year — 192,604 29,676 — 222,280 Cash and cash equivalents at end of period $ — $ 181,879 $ 28,864 $ — $ 210,743 GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS SIX MONTHS ENDED JUNE 30, 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 $ (6,640 ) $ 31,687 $ (3,327 ) $ — $ 21,720 Cash Flows from Investing Activities Cash paid for acquisitions — (18,494 ) — — (18,494 ) Net proceeds from sale of property and equipment — 12,627 151 — 12,778 Purchases of property, plant, and equipment — (3,123 ) (151 ) — (3,274 ) Net cash used in investing activities — (8,990 ) — — (8,990 ) Cash Flows from Financing Activities Long-term debt payments — (400 ) — — (400 ) Purchase of treasury stock at market prices (1,003 ) — — — (1,003 ) Net proceeds from issuance of common stock 247 — — — 247 Intercompany financing 7,396 (7,280 ) (116 ) — — Net cash provided by (used in) financing activities 6,640 (7,680 ) (116 ) — (1,156 ) Effect of exchange rate changes on cash — — 628 — 628 Net increase (decrease) in cash and cash equivalents — 15,017 (2,815 ) — 12,202 Cash and cash equivalents at beginning of year — 143,826 26,351 — 170,177 Cash and cash equivalents at end of period $ — $ 158,843 $ 23,536 $ — $ 182,379

Recent Accounting Pronounceme26

Recent Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 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. The Company does not expect a material impact to our consolidated statement of operations as a result of the adoption. Planned date of adoption: Q1 2019

Accounts Receivable (Tables)

Accounts Receivable (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable consists of the following (in thousands): June 30, 2018 December 31, 2017 Trade accounts receivable $ 157,944 $ 140,209 Costs in excess of billings 20,163 11,610 Total accounts receivables 178,107 151,819 Less allowance for doubtful accounts (6,465 ) (6,434 ) Accounts receivable $ 171,642 $ 145,385

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 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 (14,950 ) — Billings in excess of cost to revenue — 9,044 Costs in excess of billings recognized, net of reclassification to receivables 18,581 — Net billings in advance and cash payments not recognized as revenue — (11,792 ) Ending balance, June 30, 2018 $ 20,163 $ (15,527 ) (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	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 June 30, 2018 is as follows (in thousands): Consolidated Statement of Operations Three Months Ended June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Net sales $ 266,036 $ 265,752 $ 284 Cost of sales 195,533 195,581 (48 ) Gross profit 70,503 70,171 332 Provision for income taxes 6,294 6,201 93 Net income $ 22,837 $ 22,598 $ 239 Consolidated Statement of Operations Six Months Ended June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Net sales $ 481,373 $ 479,121 $ 2,252 Cost of sales 362,552 361,161 1,391 Gross profit 118,821 117,960 861 Provision for income taxes 9,101 8,859 242 Net income $ 31,189 $ 30,570 $ 619 Consolidated Balance Sheet June 30, 2018 As Reported Without Adoption of ASC 606 Effect of Change Higher (Lower) Assets Accounts receivable, net $ 171,642 $ 164,359 $ 7,283 Inventories 95,694 101,915 (6,221 ) Total current assets 489,673 488,611 1,062 Total assets 1,009,920 1,008,858 1,062 Liabilities Accrued expenses 65,174 65,005 169 Total current liabilities 169,648 169,479 169 Shareholders' equity Retained earnings 306,375 305,482 893 Total shareholders' equity 560,896 560,003 893 Total liabilities and shareholders' equity $ 1,009,920 $ 1,008,858 $ 1,062 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 six months ended June 30, 2018.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Schedule Of Inventories	Inventories consist of the following (in thousands): June 30, 2018 December 31, 2017 Raw material $ 52,835 $ 42,661 Work-in-process 7,640 10,598 Finished goods 35,219 33,113 Total inventories $ 95,694 $ 86,372

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Allocation Of Purchase Consideration To The Assets Acquired And Liabilities Assumed	The allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands): Cash $ 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 Trademarks $ 600 Indefinite Technology 1,300 10 years Customer relationships 1,700 7 years Total $ 3,600

Goodwill and Related Intangib31

Goodwill and Related Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 — (269 ) 70 (199 ) Balance at June 30, 2018 $ 198,075 $ 54,011 $ 68,789 $ 320,875
Schedule Of Acquired Intangible Assets	Acquired intangible assets consist of the following (in thousands): June 30, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Estimated Life Indefinite-lived intangible assets: Trademarks $ 45,117 $ — $ 45,107 $ — Indefinite Finite-lived intangible assets: Trademarks 5,830 3,273 5,876 3,062 5 to 15 Years Unpatented technology 28,107 12,948 28,107 12,033 5 to 20 Years Customer relationships 80,725 42,571 80,707 39,652 5 to 17 Years Non-compete agreements 1,649 1,082 1,649 931 4 to 10 Years 116,311 59,874 116,339 55,678 Total acquired intangible assets $ 161,428 $ 59,874 $ 161,446 $ 55,678
Schedule of Acquired Intangible Asset Amortization Expense	The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Amortization expense $ 2,148 $ 2,230 $ 4,287 $ 4,392
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 $ 4,048 $ 7,653 $ 7,141 $ 6,538 $ 6,126 $ 5,587

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Long-term Debt, Unclassified [Abstract]
Schedule Of Long-Term Debt	Long-term debt consists of the following (in thousands): June 30, 2018 December 31, 2017 Senior Subordinated 6.25% Notes $ 210,000 $ 210,000 Other debt 2,000 2,400 Less unamortized debt issuance costs (1,987 ) (2,379 ) Total debt 210,013 210,021 Less current maturities 400 400 Total long-term debt $ 209,613 $ 209,621

Accumulated Other Comprehensi33

Accumulated Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 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 Unamortized Post Retirement Health Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other 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 — (14 ) 88 74 21 53 Foreign currency translation adjustment (1,677 ) — — (1,677 ) — (1,677 ) Balance at June 30, 2018 $ (4,375 ) $ 172 $ (3,086 ) $ (7,289 ) $ (949 ) $ (6,340 )

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Share-based Compensation [Abstract]
Schedule Of Number Of Awards And Weighted Average Grant Date Fair Value	The following table sets forth the number of equity-based awards granted during the six months ended June 30, 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 $ 33.35 108,748 $ 42.72 Restricted stock units 69,055 $ 33.41 74,292 $ 42.39 Options — $ — 25,000 $ 42.35 Deferred stock units 10,255 $ 35.96 10,170 $ 34.42 Common shares 2,113 $ 35.50 2,034 $ 34.42
Schedule of PSU Conversion	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.
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 and six months ended June 30, (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 PSUs compensation expense $ 902 $ 341 $ 1,608 $ 2,078
Management Stock Purchase Plan	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 six months ended June 30, 2018 2017 Restricted stock units credited 69,514 88,344 Share-based liabilities paid (in thousands) $ 4,717 $ 2,353

Exit Activity Costs and Asset35

Exit Activity Costs and Asset Impairments (Tables)	6 Months Ended
	Jun. 30, 2018
Restructuring and Related Activities [Abstract]
Summary Of Exit Activity Costs And Asset Impairments	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 and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Cost of sales $ (193 ) $ (1,472 ) $ (156 ) $ (478 ) Selling, general, and administrative expense (recoveries) 356 1,678 (152 ) 3,686 Net asset impairment and exit activity charges (recoveries) $ 163 $ 206 $ (308 ) $ 3,208 Exit activity costs were incurred during the six months ended June 30, 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 354 5,945 Cash payments (1,256 ) (8,288 ) Balance at June 30 $ 59 $ 1,401

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Summary Of Provision For Income Taxes For Continuing Operations	The following table sets forth the components of the adjustment which were recorded in income tax expense from continuing operations during six month period ended June 30, 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 ) The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three and six months ended June 30, and the applicable effective tax rates: Three Months Ended Six Months Ended 2018 2017 2018 2017 Provision for income taxes $ 6,294 $ 7,853 $ 9,101 $ 9,906 Effective tax rate 21.6 % 37.3 % 22.6 % 36.6 %

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule Of Computation Of Basic And Diluted Loss Per Share	the three and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Numerator: Income from continuing operations $ 22,837 $ 13,174 $ 31,189 $ 17,170 Loss from discontinued operations — (405 ) — (405 ) Net income available to common shareholders $ 22,837 $ 12,769 $ 31,189 $ 16,765 Denominator for basic earnings per share: Weighted average shares outstanding 31,862 31,709 31,824 31,698 Denominator for diluted earnings per share: Weighted average shares outstanding 31,862 31,709 31,824 31,698 Common stock options and restricted stock 691 474 674 521 Weighted average shares and conversions 32,553 32,183 32,498 32,219

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, (in thousands): Three Months Ended Six Months Ended 2018 2017 2018 2017 Net sales: Residential Products $ 131,128 $ 127,252 $ 235,076 $ 231,803 Industrial and Infrastructure Products 61,561 57,926 116,185 108,644 Less: Intersegment sales (368 ) (314 ) (589 ) (770 ) Net Industrial and Infrastructure Products 61,193 57,612 115,596 107,874 Renewable Energy and Conservation 73,715 62,763 130,701 114,555 Total consolidated net sales $ 266,036 $ 247,627 $ 481,373 $ 454,232 Income from operations: Residential Products $ 24,196 $ 22,579 $ 37,434 $ 38,220 Industrial and Infrastructure Products 6,604 3,397 9,206 3,360 Renewable Energy and Conservation 9,556 3,492 13,618 6,832 Unallocated Corporate Expenses (8,082 ) (4,538 ) (14,141 ) (13,803 ) Total income from operations $ 32,274 $ 24,930 $ 46,117 $ 34,609
Disaggregation of Revenue	The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three and six months ended June 30 (in thousands): Three Months Ended June 30, 2018 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 130,958 $ 51,428 $ 8,724 $ 191,110 Over Time 170 9,765 64,991 74,926 Total $ 131,128 $ 61,193 $ 73,715 $ 266,036 Three Months Ended June 30, 2017 Residential Products Industrial and Infrastructure Products Renewable Energy and Conservation Total Net sales: Point in Time $ 127,252 $ 57,612 $ 5,383 $ 190,247 Over Time — — 57,380 57,380 Total $ 127,252 $ 57,612 $ 62,763 $ 247,627

Supplemental Financial Inform39

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Schedule Of Consolidating Statements Of Operations	GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 256,487 $ 14,194 $ (4,645 ) $ 266,036 Cost of sales — 189,082 10,891 (4,440 ) 195,533 Gross profit — 67,405 3,303 (205 ) 70,503 Selling, general, and administrative expense 36 36,449 1,744 — 38,229 (Loss) income from operations (36 ) 30,956 1,559 (205 ) 32,274 Interest expense (income) 3,402 (213 ) (59 ) — 3,130 Other expense (income) — 111 (98 ) — 13 (Loss) income before taxes (3,438 ) 31,058 1,716 (205 ) 29,131 (Benefit of) provision for income taxes (962 ) 6,874 382 — 6,294 Equity in earnings from subsidiaries 25,518 1,334 — (26,852 ) — Net income $ 23,042 $ 25,518 $ 1,334 $ (27,057 ) $ 22,837 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net sales $ — $ 238,652 $ 10,627 $ (1,652 ) $ 247,627 Cost of sales — 178,779 8,739 (1,716 ) 185,802 Gross profit — 59,873 1,888 64 61,825 Selling, general, and administrative expense 34 33,681 3,180 — 36,895 (Loss) income from operations (34 ) 26,192 (1,292 ) 64 24,930 Interest expense (income) 3,403 162 (15 ) — 3,550 Other expense — 115 238 — 353 (Loss) income before taxes (3,437 ) 25,915 (1,515 ) 64 21,027 (Benefit of) provision for income taxes (1,340 ) 9,360 (167 ) — 7,853 (Loss) income from continuing operations (2,097 ) 16,555 (1,348 ) 64 13,174 Discontinued operations: Loss from discontinued operations before taxes — (644 ) — — (644 ) Benefit of income taxes — (239 ) — — (239 ) Loss from discontinued operations — (405 ) — — (405 ) Equity in earnings (loss) from subsidiaries 14,802 (1,348 ) — (13,454 ) — Net income (loss) $ 12,705 $ 14,802 $ (1,348 ) $ (13,390 ) $ 12,769
Schedule Of Consolidating Statements Of Comprehensive Income	IBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income $ 23,042 $ 25,518 $ 1,334 $ (27,057 ) $ 22,837 Other comprehensive (loss) income: Foreign currency translation adjustment — — (1,787 ) — (1,787 ) Adjustment to retirement benefit liability, net of tax — (5 ) — — (5 ) Adjustment to post employment health care benefit liability, net of tax — 31 — — 31 Other comprehensive income (loss) — 26 (1,787 ) — (1,761 ) Total comprehensive income (loss) $ 23,042 $ 25,544 $ (453 ) $ (27,057 ) $ 21,076 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income (loss) $ 12,705 $ 14,802 $ (1,348 ) $ (13,390 ) $ 12,769 Other comprehensive income (loss): Foreign currency translation adjustment — — 1,091 — 1,091 Adjustment to retirement benefit liability, net of tax — (3 ) — — (3 ) Adjustment to post employment health care benefit liability, net of tax — 30 — — 30 Other comprehensive income — 27 1,091 — 1,118 Total comprehensive income (loss) $ 12,705 $ 14,829 $ (257 ) $ (13,390 ) $ 13,887 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income $ 31,531 $ 36,488 $ 2,424 $ (39,254 ) $ 31,189 Other comprehensive (loss) income: Foreign currency translation adjustment — — (1,677 ) — (1,677 ) Cumulative effect of change in accounting (see Note 2 ) — (350 ) — — (350 ) Adjustment to retirement benefit liability, net of tax — (10 ) — — (10 ) Adjustment to post employment health care benefit liability, net of tax — 63 — — 63 Other comprehensive loss — (297 ) (1,677 ) — (1,974 ) Total comprehensive income $ 31,531 $ 36,191 $ 747 $ (39,254 ) $ 29,215 GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2017 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Net income (loss) $ 16,947 $ 21,145 $ (2,040 ) $ (19,287 ) $ 16,765 Other comprehensive income (loss): Foreign currency translation adjustment — — 1,770 — 1,770 Adjustment to retirement benefit liability, net of tax — (6 ) — — (6 ) Adjustment to post employment health care benefit liability, net of tax — 59 — — 59 Other comprehensive income — 53 1,770 — 1,823 Total comprehensive income (loss) $ 16,947 $ 21,198 $ (270 ) $ (19,287 ) $ 18,588
Schedule Of Consolidating Balance Sheets	STRIES, INC. CONSOLIDATING BALANCE SHEETS JUNE 30, 2018 (in thousands) Gibraltar Industries, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Assets Current assets: Cash and cash equivalents $ — $ 181,879 $ 28,864 $ — $ 210,743 Accounts receivable, net — 164,357 7,285 — 171,642 Intercompany balances (1,220 ) 4,505 (3,285 ) — — Inventories — 91,611 4,083 — 95,694 Other current assets 1,975 5,708 3,911 — 11,594 Total current assets 755 448,060 40,858 — 489,673 Property, plant, and equipment, net — 90,333 2,888 — 93,221 Goodwill — 298,258 22,617 — 320,875 Acquired intangibles — 93,367 8,187 — 101,554 Other assets — 4,597 — — 4,597 Investment in subsidiaries 774,373 62,074 — (836,447 ) — $ 775,128 $ 996,689 $ 74,550 $ (836,447 ) $ 1,009,920 Liabilities and Shareholders’ Equity Current liabilities: Accounts payable $ — $ 84,166 $ 4,381 $ — $ 88,547 Accrued expenses 5,469 56,377 3,328 — 65,174 Billings in excess of cost — 13,028 2,499 15,527 Current maturities of long-term debt — 400 — — 400 Total current liabilities 5,469 153,971 10,208 — 169,648 Long-term debt 208,763 850 — — 209,613 Deferred income taxes — 28,928 2,268 — 31,196 Other non-current liabilities — 38,567 — — 38,567 Shareholders’ equity 560,896 774,373 62,074 (836,447 ) 560,896 $ 775,128 $ 996,689 $ 74,550 $ (836,447 ) $ 1,009,920 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 SIX MONTHS ENDED JUNE 30, 2018 (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 $ (6,643 ) $ 884 $ 1,956 $ — $ (3,803 ) Cash Flows from Investing Activities Net proceeds from sale of property and equipment — 2,864 65 — 2,929 Purchases of property, plant, and equipment — (3,564 ) (140 ) — (3,704 ) Net cash used in investing activities — (700 ) (75 ) — (775 ) Cash Flows from Financing Activities Long-term debt payments — (400 ) — — (400 ) Purchase of treasury stock at market prices (6,016 ) — — — (6,016 ) Net proceeds from issuance of common stock 526 — — — 526 Intercompany financing 12,133 (10,509 ) (1,624 ) — — Net cash provided by (used in) financing activities 6,643 (10,909 ) (1,624 ) — (5,890 ) Effect of exchange rate changes on cash — — (1,069 ) — (1,069 ) Net decrease in cash and cash equivalents — (10,725 ) (812 ) — (11,537 ) Cash and cash equivalents at beginning of year — 192,604 29,676 — 222,280 Cash and cash equivalents at end of period $ — $ 181,879 $ 28,864 $ — $ 210,743 GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS SIX MONTHS ENDED JUNE 30, 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 $ (6,640 ) $ 31,687 $ (3,327 ) $ — $ 21,720 Cash Flows from Investing Activities Cash paid for acquisitions — (18,494 ) — — (18,494 ) Net proceeds from sale of property and equipment — 12,627 151 — 12,778 Purchases of property, plant, and equipment — (3,123 ) (151 ) — (3,274 ) Net cash used in investing activities — (8,990 ) — — (8,990 ) Cash Flows from Financing Activities Long-term debt payments — (400 ) — — (400 ) Purchase of treasury stock at market prices (1,003 ) — — — (1,003 ) Net proceeds from issuance of common stock 247 — — — 247 Intercompany financing 7,396 (7,280 ) (116 ) — — Net cash provided by (used in) financing activities 6,640 (7,680 ) (116 ) — (1,156 ) Effect of exchange rate changes on cash — — 628 — 628 Net increase (decrease) in cash and cash equivalents — 15,017 (2,815 ) — 12,202 Cash and cash equivalents at beginning of year — 143,826 26,351 — 170,177 Cash and cash equivalents at end of period $ — $ 158,843 $ 23,536 $ — $ 182,379

Recent Accounting Pronounceme40

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 306,375	$ 274,836	$ 274,562
Accumulated Other Comprehensive Income (Loss), Net of Tax	6,340		$ 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	$ 893	$ 274

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade accounts receivable	$ 157,944		$ 140,209
Costs in excess of billings	20,163		11,610
Total accounts receivables	178,107		151,819
Less allowance for doubtful accounts	(6,465)		(6,434)
Accounts receivable	$ 171,642	$ 150,307	$ 145,385

Revenue - Narrative (Details)

Revenue - Narrative (Details)	6 Months Ended
	Jun. 30, 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 L

Revenue - Contract Assets and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Costs in Excess of Billings
Beginning balance, January 1, 2018	$ 16,532
Costs in excess of billings to receivables	(14,950)
Costs in excess of billings recognized, net of reclassification to receivables	18,581
Ending balance, June 30, 2018	20,163
Billings in Excess of Cost
Beginning balance, January 1, 2018	(12,779)
Billings in excess of cost to revenue	9,044
Net billings in advance and cash payments not recognized as revenue	(11,792)
Ending balance, June 30, 2018	$ (15,527)

Revenue - Effects of Topic 606

Revenue - Effects of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 171,642		$ 171,642		$ 150,307	$ 145,385
Costs in excess of billings	20,163		20,163		16,532	16,532
Inventories	95,694		95,694		81,637	86,372
Total current assets	489,673		489,673		462,951	462,764
Total assets	1,009,920		1,009,920		991,572	991,385
Liabilities
Accrued expenses	65,174		65,174		75,380	75,467
Total current liabilities	169,648		169,648		170,946	171,033
Shareholders' equity
Retained earnings	306,375		306,375		274,836	274,562
Total shareholders' equity	560,896		560,896		531,993	531,719
Total liabilities and shareholders' equity	1,009,920		1,009,920		991,572	991,385
Net sales:	266,036	$ 247,627	481,373	$ 454,232
Cost of sales	195,533	185,802	362,552	343,152
Gross profit	70,503	61,825	118,821	111,080
Provision for income taxes	6,294	7,853	9,101	9,906
Net income	22,837	$ 12,769	31,189	$ 16,765
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Accounts receivable, net	164,359		164,359			145,385
Costs in excess of billings						11,610
Inventories	101,915		101,915			86,372
Total current assets	488,611		488,611			462,764
Total assets	1,008,858		1,008,858			991,385
Liabilities
Accrued expenses	65,005		65,005			75,467
Total current liabilities	169,479		169,479			171,033
Shareholders' equity
Retained earnings	305,482		305,482			274,562
Total shareholders' equity	560,003		560,003			531,719
Total liabilities and shareholders' equity	1,008,858		1,008,858			$ 991,385
Net sales:	265,752		479,121
Cost of sales	195,581		361,161
Gross profit	70,171		117,960
Provision for income taxes	6,201		8,859
Net income	22,598		30,570
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Assets
Accounts receivable, net	7,283		7,283		4,922
Costs in excess of billings					4,922
Inventories	(6,221)		(6,221)		(4,735)
Total current assets	1,062		1,062		187
Total assets	1,062		1,062		187
Liabilities
Accrued expenses	169		169		(87)
Total current liabilities	169		169		(87)
Shareholders' equity
Retained earnings	893		893		274
Total shareholders' equity	893		893		274
Total liabilities and shareholders' equity	1,062		1,062		$ 187
Net sales:	284		2,252
Cost of sales	(48)		1,391
Gross profit	332		861
Provision for income taxes	93		242
Net income	$ 239		$ 619

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw material	$ 52,835		$ 42,661
Work-in-process	7,640		10,598
Finished goods	35,219		33,113
Total inventories	$ 95,694	$ 81,637	$ 86,372

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Feb. 22, 2017
Business Acquisition [Line Items]
Goodwill				$ 320,875	$ 321,074
Package Concierge
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 18,900
Goodwill						$ 16,790
Acquisition related costs		$ 13	$ 115

Acquisitions (Allocation of Pur

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Feb. 22, 2017
Business Acquisition [Line Items]
Goodwill	$ 320,875	$ 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 Acqui

Acquisitions (Schedule of Acquired Intangible Assets) (Details) $ in Thousands	Feb. 22, 2017USD ($)
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 Intangib49

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Goodwill [Roll Forward]
Balance at	$ 321,074
Foreign currency translation	(199)
Balance at	320,875
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	(269)
Balance at	54,011
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at	68,719
Foreign currency translation	70
Balance at	$ 68,789

Goodwill and Related Intangib50

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 116,311	$ 116,339
Total acquired intangible assets, Gross Carrying Amount	161,428	161,446
Accumulated Amortization, Finite-lived intangible assets	59,874	55,678
Total acquired intangible assets, Accumulated Amortization	59,874	55,678
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,830	5,876
Accumulated Amortization, Finite-lived intangible assets	3,273	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	12,948	12,033
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	80,725	80,707
Accumulated Amortization, Finite-lived intangible assets	42,571	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	$ 1,082	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	$ 45,117	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 Intangib51

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,148	$ 2,230	$ 4,287	$ 4,392
2,018	4,048		4,048
2,019	7,653		7,653
2,020	7,141		7,141
2,021	6,538		6,538
2,022	6,126		6,126
2,023	$ 5,587		$ 5,587

Long-Term Debt (Schedule of Lon

Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2013
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ (1,987)	$ (2,379)
Total debt	(210,013)	(210,021)
Less current maturities	400	400
Total long-term debt	209,613	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	$ (2,000)	$ (2,400)

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	Dec. 09, 2015	Jun. 30, 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 Comprehensi54

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 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	$ (1,761)	$ 1,118	(1,974)	$ 1,823
AOCI before tax, ending balance	(7,289)		(7,289)
Accumulated other comprehensive income, tax, ending balance	(949)		(949)
Accumulated Other Comprehensive Income Ending Balance	(6,340)		(6,340)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance			(2,698)
Other comprehensive income adjustments			(1,677)
Other comprehensive income (loss), net of tax			(1,677)
AOCI before tax, ending balance	(4,375)		(4,375)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments			74
Other comprehensive income (loss), tax			21
Other comprehensive income (loss), net of tax			53
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			(14)
AOCI before tax, ending balance	172		172
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			88
AOCI before tax, ending balance	$ (3,086)		$ (3,086)
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 - Inc

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

Equity-Based Compensation (Sche

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	132,288	108,748
Weighted average grant date fair value (in USD per share)	$ 33.35	$ 42.72
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	69,055	74,292
Weighted average grant date fair value (in USD per share)	$ 33.41	$ 42.39
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	0	25,000
Weighted average grant date fair value (in USD per share)	$ 0	$ 42.35
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	10,255	10,170
Weighted average grant date fair value (in USD per share)	$ 35.96	$ 34.42
Common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)	2,113	2,034
Weighted average grant date fair value (in USD per share)	$ 35.50	$ 34.42

Equity-Based Compensation (Equi

Equity-Based Compensation (Equity Based Awards - Settled in Stock) (Details) - Performance stock units - shares	1 Months Ended		6 Months Ended
	Feb. 29, 2020	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units awarded (in shares)			132,288	108,748
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 | 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 (Perf

Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 34.5
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	$ 21.3

Equity-Based Compensation (Sc59

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs compensation expense	$ 902	$ 341	$ 1,608	$ 2,078

Equity-Based Compensation (Mana

Equity-Based Compensation (Management Stock Purchase Plan) (Details) - Management Stock Purchase Plan - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 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	$ 69,514	$ 88,344

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2013
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of outstanding debt	$ 211,800	$ 213,800
Carrying value of outstanding debt	210,013	210,021
Senior Subordinated 6.25% Notes
Fair Value Measurement Inputs and 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 Asset62

Exit Activity Costs and Asset Impairments (Narrative) (Details) - facility	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Number of facilities closed	1	3

Exit Activity Costs and Asset63

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	$ 65	$ (1,820)	$ (662)	$ (2,737)
Exit activity (recoveries) costs, net	98	2,026	354	5,945
Total exit activity costs & asset impairments	163	206	(308)	3,208
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	(126)	(43)	(147)
Exit activity (recoveries) costs, net	(29)	207	(152)	392
Total exit activity costs & asset impairments	(29)	81	(195)	245
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	(1,694)	(703)	(2,590)
Exit activity (recoveries) costs, net	(28)	315	190	2,971
Total exit activity costs & asset impairments	(28)	(1,379)	(513)	381
Renewable Energy & Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	65	0	84	0
Exit activity (recoveries) costs, net	(68)	1,369	49	2,419
Total exit activity costs & asset impairments	(3)	1,369	133	2,419
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	0
Exit activity (recoveries) costs, net	223	135	267	163
Total exit activity costs & asset impairments	$ 223	$ 135	$ 267	$ 163

Exit Activity Costs and Asset64

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 163	$ 206	$ (308)	$ 3,208
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(193)	(1,472)	(156)	(478)
Selling, general, and administrative expense (recoveries)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 356	$ 1,678	$ (152)	$ 3,686

Exit Activity Costs and Asset65

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Exit activity (recoveries) costs, net	$ 98	$ 2,026	$ 354	$ 5,945
Restructuring Reserve [Roll Forward]
Beginning balance		$ 1,401	961	3,744
Cash payments			(1,256)	$ (8,288)
Ending balance	$ 59		$ 59

Income Taxes (Provision For Inc

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 6,294	$ 7,853	$ 9,101	$ 9,906
Effective tax rate	21.60%	37.30%	22.60%	36.60%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jan. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tax benefit due to performance share unit vesting			$ 1,900
Pretax losses	$ 29,131	$ 21,027	40,290	$ 27,076
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	$ (6,340)		(6,340)		(4,366)
Retained earnings	306,375		306,375		$ 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)		(350)
Retained earnings	350		$ 350
Europe | Solar Racking Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax losses	$ 2,000

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provisional Income Tax Adjustments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
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)

Earnings per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 22,837	$ 12,769	$ 31,189	$ 16,765
Weighted average basic shares outstanding (in shares)	31,862	31,709	31,824	31,698
Common stock options and restricted stock (in shares)	691	474	674	521
Weighted average shares outstanding, diluted (in shares)	32,553	32,183	32,498	32,219
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	377	556	368	541

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)segment	Jun. 30, 2017USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments | segment			3
Net sales:	$ 266,036	$ 247,627	$ 481,373	$ 454,232
Income from operations:	70,503	61,825	118,821	111,080
Unallocated Corporate Expenses	(8,082)	(4,538)	(14,141)	(13,803)
Total income from operations	32,274	24,930	46,117	34,609
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	131,128	127,252	235,076	231,803
Income from operations:	24,196	22,579	37,434	38,220
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	61,193	57,612	115,596	107,874
Income from operations:	6,604	3,397	9,206	3,360
Renewable Energy & Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	73,715	62,763	130,701	114,555
Income from operations:	9,556	3,492	13,618	6,832
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(368)	(314)	(589)	(770)
Intersegment Elimination | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 61,561	$ 57,926	$ 116,185	$ 108,644

Segment Information - Disaggreg

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales:	$ 266,036	$ 247,627	$ 481,373	$ 454,232
Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	131,128	127,252	235,076	231,803
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	61,193	57,612	115,596	107,874
Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	73,715	62,763	130,701	114,555
Point in Time
Disaggregation of Revenue [Line Items]
Net sales:	191,110	190,247	346,157	350,853
Point in Time | Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	130,958	127,252	233,842	231,803
Point in Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	51,428	57,612	97,971	107,874
Point in Time | Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	8,724	5,383	14,344	11,176
Over Time
Disaggregation of Revenue [Line Items]
Net sales:	74,926	57,380	135,216	103,379
Over Time | Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	170	0	1,234	0
Over Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	9,765	0	17,625	0
Over Time | Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	$ 64,991	$ 57,380	$ 116,357	$ 103,379

Supplemental Financial Inform72

Supplemental Financial Information (Narrative) (Details)	6 Months Ended
	Jun. 30, 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 Inform73

Supplemental Financial Information (Schedule of Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net sales:	$ 266,036	$ 247,627	$ 481,373	$ 454,232
Cost of sales	195,533	185,802	362,552	343,152
Gross profit	70,503	61,825	118,821	111,080
Selling, general, and administrative expense	38,229	36,895	72,704	76,471
Income from operations	32,274	24,930	46,117	34,609
Interest expense	3,130	3,550	6,399	7,126
Other expense (income)	13	353	(572)	407
Income before taxes	29,131	21,027	40,290	27,076
Provision for income taxes	6,294	7,853	9,101	9,906
Income from continuing operations	22,837	13,174	31,189	17,170
Loss before taxes	0	(644)	0	(644)
Benefit of income taxes	0	(239)	0	(239)
Loss from discontinued operations	0	(405)	0	(405)
Equity in earnings (loss) from subsidiaries	0	0	0	0
Net income	22,837	12,769	31,189	16,765
Reportable Legal Entities | Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net sales:	256,487	238,652	460,954	436,400
Cost of sales	189,082	178,779	347,666	329,286
Gross profit	67,405	59,873	113,288	107,114
Selling, general, and administrative expense	36,449	33,681	69,173	70,187
Income from operations	30,956	26,192	44,115	36,927
Interest expense	(213)	162	(297)	354
Other expense (income)	111	115	139	245
Income before taxes	31,058	25,915	44,273	36,328
Provision for income taxes	6,874	9,360	10,209	12,738
Income from continuing operations		16,555		23,590
Loss before taxes		(644)		(644)
Benefit of income taxes		(239)		(239)
Loss from discontinued operations		(405)		(405)
Equity in earnings (loss) from subsidiaries	1,334	(1,348)	2,424	(2,040)
Net income	25,518	14,802	36,488	21,145
Reportable Legal Entities | Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net sales:	14,194	10,627	26,524	21,869
Cost of sales	10,891	8,739	20,649	17,721
Gross profit	3,303	1,888	5,875	4,148
Selling, general, and administrative expense	1,744	3,180	3,451	6,207
Income from operations	1,559	(1,292)	2,424	(2,059)
Interest expense	(59)	(15)	(108)	(33)
Other expense (income)	(98)	238	(711)	162
Income before taxes	1,716	(1,515)	3,243	(2,188)
Provision for income taxes	382	(167)	819	(148)
Income from continuing operations		(1,348)		(2,040)
Loss before taxes		0		0
Benefit of income taxes		0		0
Loss from discontinued operations		0		0
Equity in earnings (loss) from subsidiaries	0	0	0	0
Net income	1,334	(1,348)	2,424	(2,040)
Reportable Legal Entities | Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net sales:	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling, general, and administrative expense	36	34	80	77
Income from operations	(36)	(34)	(80)	(77)
Interest expense	3,402	3,403	6,804	6,805
Other expense (income)	0	0	0	0
Income before taxes	(3,438)	(3,437)	(6,884)	(6,882)
Provision for income taxes	(962)	(1,340)	(1,927)	(2,684)
Income from continuing operations		(2,097)		(4,198)
Loss before taxes		0		0
Benefit of income taxes		0		0
Loss from discontinued operations		0		0
Equity in earnings (loss) from subsidiaries	25,518	14,802	36,488	21,145
Net income	23,042	12,705	31,531	16,947
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net sales:	(4,645)	(1,652)	(6,105)	(4,037)
Cost of sales	(4,440)	(1,716)	(5,763)	(3,855)
Gross profit	(205)	64	(342)	(182)
Selling, general, and administrative expense	0	0	0	0
Income from operations	(205)	64	(342)	(182)
Interest expense	0	0	0	0
Other expense (income)	0	0	0	0
Income before taxes	(205)	64	(342)	(182)
Provision for income taxes	0	0	0	0
Income from continuing operations		64		(182)
Loss before taxes		0		0
Benefit of income taxes		0		0
Loss from discontinued operations		0		0
Equity in earnings (loss) from subsidiaries	(26,852)	(13,454)	(38,912)	(19,105)
Net income	$ (27,057)	$ (13,390)	$ (39,254)	$ (19,287)

Supplemental Financial Inform74

Supplemental Financial Information (Schedule of Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net income	$ 22,837	$ 12,769	$ 31,189	$ 16,765
Other comprehensive (loss) income:
Foreign currency translation adjustment	(1,787)	1,091	(1,677)	1,770
Cumulative effect of accounting change (see Note 2)			(350)
Adjustment to retirement benefit liability, net of tax	(5)	(3)	(10)	(6)
Adjustment to post employment health care benefit liability, net of tax	31	30	63	59
Other comprehensive (loss) income	(1,761)	1,118	(1,974)	1,823
Total comprehensive income	21,076	13,887	29,215	18,588
Reportable Legal Entities | Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net income	25,518	14,802	36,488	21,145
Other comprehensive (loss) income:
Foreign currency translation adjustment	0	0	0	0
Cumulative effect of accounting change (see Note 2)			(350)
Adjustment to retirement benefit liability, net of tax	(5)	(3)	(10)	(6)
Adjustment to post employment health care benefit liability, net of tax	31	30	63	59
Other comprehensive (loss) income	26	27	(297)	53
Total comprehensive income	25,544	14,829	36,191	21,198
Reportable Legal Entities | Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net income	1,334	(1,348)	2,424	(2,040)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(1,787)	1,091	(1,677)	1,770
Cumulative effect of accounting change (see Note 2)			0
Adjustment to retirement benefit liability, net of tax	0	0	0	0
Adjustment to post employment health care benefit liability, net of tax	0	0	0	0
Other comprehensive (loss) income	(1,787)	1,091	(1,677)	1,770
Total comprehensive income	(453)	(257)	747	(270)
Reportable Legal Entities | Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net income	23,042	12,705	31,531	16,947
Other comprehensive (loss) income:
Foreign currency translation adjustment	0	0	0	0
Cumulative effect of accounting change (see Note 2)			0
Adjustment to retirement benefit liability, net of tax	0	0	0	0
Adjustment to post employment health care benefit liability, net of tax	0	0	0	0
Other comprehensive (loss) income	0	0	0	0
Total comprehensive income	23,042	12,705	31,531	16,947
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net income	(27,057)	(13,390)	(39,254)	(19,287)
Other comprehensive (loss) income:
Foreign currency translation adjustment	0	0	0	0
Cumulative effect of accounting change (see Note 2)			0
Adjustment to retirement benefit liability, net of tax	0	0	0	0
Adjustment to post employment health care benefit liability, net of tax	0	0	0	0
Other comprehensive (loss) income	0	0	0	0
Total comprehensive income	$ (27,057)	$ (13,390)	$ (39,254)	$ (19,287)

Supplemental Financial Inform75

Supplemental Financial Information (Schedule of Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	$ 210,743		$ 222,280	$ 182,379	$ 170,177	$ 182,379	$ 170,177
Accounts receivable, net	171,642	$ 150,307	145,385
Intercompany balances	0		0
Inventories	95,694	81,637	86,372
Other current assets	11,594		8,727
Total current assets	489,673	462,951	462,764
Property, plant, and equipment, net	93,221		97,098
Goodwill	320,875		321,074
Acquired intangibles	101,554		105,768
Other assets	4,597		4,681
Investment in subsidiaries	0		0
Total assets	1,009,920	991,572	991,385
Accounts payable	88,547		82,387
Accrued expenses	65,174	75,380	75,467
Billings in excess of cost	15,527		12,779
Current maturities of long-term debt	400		400
Total current liabilities	169,648	170,946	171,033
Long-term debt	209,613		209,621
Deferred income taxes	31,196		31,237
Other non-current liabilities	38,567		47,775
Total shareholders’ equity	560,896	531,993	531,719
Total liabilities and shareholders' equity	1,009,920	$ 991,572	991,385
Reportable Legal Entities | Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	181,879		192,604			158,843	143,826
Accounts receivable, net	164,357		138,903
Intercompany balances	4,505		4,166
Inventories	91,611		82,457
Other current assets	5,708		(368)
Total current assets	448,060		417,762
Property, plant, and equipment, net	90,333		93,906
Goodwill	298,258		298,258
Acquired intangibles	93,367		97,171
Other assets	4,597		4,681
Investment in subsidiaries	62,074		61,746
Total assets	996,689		973,524
Accounts payable	84,166		77,786
Accrued expenses	56,377		67,746
Billings in excess of cost	13,028		9,840
Current maturities of long-term debt	400		400
Total current liabilities	153,971		155,772
Long-term debt	850		1,100
Deferred income taxes	28,928		28,907
Other non-current liabilities	38,567		47,775
Total shareholders’ equity	774,373		739,970
Total liabilities and shareholders' equity	996,689		973,524
Reportable Legal Entities | Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	28,864		29,676			23,536	26,351
Accounts receivable, net	7,285		6,482
Intercompany balances	(3,285)		(4,490)
Inventories	4,083		3,915
Other current assets	3,911		3,680
Total current assets	40,858		39,263
Property, plant, and equipment, net	2,888		3,192
Goodwill	22,617		22,816
Acquired intangibles	8,187		8,597
Other assets	0		0
Investment in subsidiaries	0		0
Total assets	74,550		73,868
Accounts payable	4,381		4,601
Accrued expenses	3,328		2,252
Billings in excess of cost	2,499		2,939
Current maturities of long-term debt	0		0
Total current liabilities	10,208		9,792
Long-term debt	0		0
Deferred income taxes	2,268		2,330
Other non-current liabilities	0		0
Total shareholders’ equity	62,074		61,746
Total liabilities and shareholders' equity	74,550		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	(1,220)		324
Inventories	0		0
Other current assets	1,975		5,415
Total current assets	755		5,739
Property, plant, and equipment, net	0		0
Goodwill	0		0
Acquired intangibles	0		0
Other assets	0		0
Investment in subsidiaries	774,373		739,970
Total assets	775,128		745,709
Accounts payable	0		0
Accrued expenses	5,469		5,469
Billings in excess of cost	0		0
Current maturities of long-term debt	0		0
Total current liabilities	5,469		5,469
Long-term debt	208,763		208,521
Deferred income taxes	0		0
Other non-current liabilities	0		0
Total shareholders’ equity	560,896		531,719
Total liabilities and shareholders' equity	775,128		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	(836,447)		(801,716)
Total assets	(836,447)		(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	(836,447)		(801,716)
Total liabilities and shareholders' equity	$ (836,447)		$ (801,716)

Supplemental Financial Inform76

Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	$ (3,803)	$ 21,720
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired	0	(18,494)
Net proceeds from sale of property and equipment	2,929	12,778
Purchases of property, plant, and equipment	(3,704)	(3,274)
Net cash used in investing activities	(775)	(8,990)
Cash Flows from Financing Activities
Long-term debt payments	(400)	(400)
Purchase of treasury stock at market prices	(6,016)	(1,003)
Net proceeds from issuance of common stock	526	247
Intercompany financing	0	0
Net cash used in financing activities	(5,890)	(1,156)
Effect of exchange rate changes on cash	(1,069)	628
Net (decrease) increase in cash and cash equivalents	(11,537)	12,202
Cash and cash equivalents at beginning of year	222,280	170,177
Cash and cash equivalents at end of period	210,743	182,379
Reportable Legal Entities | Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	884	31,687
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		(18,494)
Net proceeds from sale of property and equipment	2,864	12,627
Purchases of property, plant, and equipment	(3,564)	(3,123)
Net cash used in investing activities	(700)	(8,990)
Cash Flows from Financing Activities
Long-term debt payments	(400)	(400)
Purchase of treasury stock at market prices	0	0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(10,509)	(7,280)
Net cash used in financing activities	(10,909)	(7,680)
Effect of exchange rate changes on cash	0	0
Net (decrease) increase in cash and cash equivalents	(10,725)	15,017
Cash and cash equivalents at beginning of year	192,604
Cash and cash equivalents at end of period	181,879
Reportable Legal Entities | Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	1,956	(3,327)
Cash Flows from Investing Activities
Cash paid for acquisitions, net of cash acquired		0
Net proceeds from sale of property and equipment	65	151
Purchases of property, plant, and equipment	(140)	(151)
Net cash used in investing activities	(75)	0
Cash Flows from Financing Activities
Long-term debt payments	0	0
Purchase of treasury stock at market prices	0	0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(1,624)	(116)
Net cash used in financing activities	(1,624)	(116)
Effect of exchange rate changes on cash	(1,069)	628
Net (decrease) increase in cash and cash equivalents	(812)	(2,815)
Cash and cash equivalents at beginning of year	29,676
Cash and cash equivalents at end of period	28,864
Reportable Legal Entities | Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by (used in) operating activities	(6,643)	(6,640)
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 used in investing activities	0	0
Cash Flows from Financing Activities
Long-term debt payments	0	0
Purchase of treasury stock at market prices	(6,016)	(1,003)
Net proceeds from issuance of common stock	526	247
Intercompany financing	12,133	7,396
Net cash used in financing activities	6,643	6,640
Effect of exchange rate changes on cash	0	0
Net (decrease) increase 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 used in investing activities	0	0
Cash Flows from Financing Activities
Long-term debt payments	0	0
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) increase 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