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Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2019	Jul. 24, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	0-22462
Entity Registrant Name	GIBRALTAR INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1445150
Entity Address, Address Line One	3556 Lake Shore Road
Entity Address, Address Line Two	P.O. Box 2028
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14219-0228
City Area Code	716
Local Phone Number	826-6500
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	ROCK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,224,233
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000912562
Current Fiscal Year End Date	--12-31

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Cost of sales	199,097	195,533	382,614	362,552
Gross profit	63,558	70,503	107,458	118,821
Selling, general, and administrative expense	36,952	38,229	70,286	72,704
Income from operations	26,606	32,274	37,172	46,117
Interest expense	219	3,130	2,280	6,399
Other (income) expense	(13)	13	576	(572)
Income before taxes	26,400	29,131	34,316	40,290
Provision for income taxes	6,487	6,294	8,058	9,101
Net income	$ 19,913	$ 22,837	$ 26,258	$ 31,189
Net earnings per share – Basic:
Income from continuing operations - Net earnings per share - Basic (in USD per share)	$ 0.62	$ 0.72	$ 0.81	$ 0.98
Income from continuing operations - Net earnings per share - Diluted (in USD per share)	$ 0.61	$ 0.70	$ 0.80	$ 0.96
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	32,321	31,862	32,300	31,824
Weighted average shares outstanding, diluted (in shares)	32,642	32,553	32,630	32,498

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 19,913	$ 22,837	$ 26,258	$ 31,189
Other comprehensive income (loss):
Foreign currency translation adjustment	998	(1,787)	1,840	(1,677)
Cumulative effect of accounting change	0	0	0	(350)
Minimum pension and post retirement benefit plan adjustments	12	26	24	53
Other comprehensive income (loss)	1,010	(1,761)	1,864	(1,974)
Total comprehensive income	$ 20,923	$ 21,076	$ 28,122	$ 29,215

- Definition

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

+ References + Details

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 81,882	$ 297,006
Accounts receivable, net	180,701	140,283
Inventories	85,398	98,913
Other current assets	13,264	8,351
Total current assets	361,245	544,553
Property, plant, and equipment, net	95,867	95,830
Operating lease assets	30,029
Goodwill	324,019	323,671
Acquired intangibles	92,930	96,375
Other assets	2,768	1,216
Total assets	906,858	1,061,645
Current liabilities:
Accounts payable	83,140	79,136
Accrued expenses	66,980	87,074
Billings in excess of cost	38,133	17,857
Current maturities of long-term debt	0	208,805
Total current liabilities	188,253	392,872
Long-term debt	0	1,600
Deferred income taxes	37,380	36,530
Non-current operating lease liabilities	21,375
Other non-current liabilities	30,303	33,950
Shareholders’ equity:
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding	0	0
Common stock, $0.01 par value; authorized 50,000 shares; 33,101 shares and 32,887 shares issued and outstanding in 2019 and 2018	331	329
Additional paid-in capital	288,822	282,525
Retained earnings	366,835	338,995
Accumulated other comprehensive loss	(5,370)	(7,234)
Cost of 880 and 796 common shares held in treasury in 2019 and 2018	(21,071)	(17,922)
Total shareholders’ equity	629,547	596,693
Total liabilities and shareholders' equity	$ 906,858	$ 1,061,645

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	33,101,000	32,887,000
Treasury stock, shares (in shares)	880,000	796,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities
Net income	$ 26,258	$ 31,189
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	9,892	10,345
Stock compensation expense	6,091	4,828
Exit activity recoveries, non-cash	0	(662)
Provision for deferred income taxes	278	0
Other, net	2,437	657
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(41,156)	(22,048)
Inventories	13,464	(14,985)
Other current assets and other assets	(4,983)	(2,840)
Accounts payable	4,012	6,064
Accrued expenses and other non-current liabilities	(9,807)	(16,351)
Net cash provided by (used in) operating activities	6,486	(3,803)
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(264)	0
Net proceeds from sale of property and equipment	60	2,929
Purchases of property, plant, and equipment	(6,265)	(3,704)
Net cash used in investing activities	(6,469)	(775)
Cash Flows from Financing Activities
Long-term debt payments	(212,000)	(400)
Payment of debt issuance costs	(1,235)	0
Purchase of treasury stock at market prices	(3,149)	(6,016)
Net proceeds from issuance of common stock	208	526
Net cash used in financing activities	(216,176)	(5,890)
Effect of exchange rate changes on cash	1,035	(1,069)
Net decrease in cash and cash equivalents	(215,124)	(11,537)
Cash and cash equivalents at beginning of year	297,006	222,280
Cash and cash equivalents at end of period	$ 81,882	$ 210,743

Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, shares at Dec. 31, 2017		32,332				615
Balance, value at Dec. 31, 2017	$ 531,719	$ 323	$ 271,957	$ 274,562	$ (4,366)	$ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,352			8,352
Foreign currency translation adjustment	110				110
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	27				27
Stock compensation expense	2,097		2,097
Stock options exercised, shares		13
Stock options exercised	226	$ 0	226
Net settlement of restricted stock units, shares		53				24
Net settlement of restricted stock units	(850)	$ 1	(1)			$ (850)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
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)
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)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,837
Foreign currency translation adjustment	(1,787)				(1,787)
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	26				26
Stock compensation expense	2,731		2,731
Stock options exercised, shares		21
Stock options exercised	$ 300		300
Awards of common shares (in shares)	2
Net settlement of restricted stock units, shares		334				128
Net settlement of restricted stock units	$ (5,166)	$ 3	(3)			$ (5,166)
Balance, shares at Jun. 30, 2018		32,755				767
Balance, value at Jun. 30, 2018	560,896	$ 327	277,307	306,375	(6,340)	$ (16,773)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,345
Foreign currency translation adjustment	842				842
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	2,371		2,371
Stock options exercised, shares		12
Stock options exercised	139		139
Net settlement of restricted stock units, shares		127				59
Net settlement of restricted stock units	(2,151)	$ 1	(1)			$ (2,151)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,258
Foreign currency translation adjustment	1,840
Balance, shares at Jun. 30, 2019		33,101				880
Balance, value at Jun. 30, 2019	629,547	$ 331	288,822	366,835	(5,370)	$ (21,071)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,913
Foreign currency translation adjustment	998				998
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	3,720		3,720
Stock options exercised, shares		5
Stock options exercised	$ 69		69
Awards of common shares (in shares)	8
Net settlement of restricted stock units, shares		62				25
Net settlement of restricted stock units	$ (998)	$ 1	(1)			$ (998)
Balance, shares at Jun. 30, 2019		33,101				880
Balance, value at Jun. 30, 2019	$ 629,547	$ 331	$ 288,822	$ 366,835	$ (5,370)	$ (21,071)

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

Consolidated Financial Statements	6 Months Ended
Consolidated Financial Statements	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CONSOLIDATED FINANCIAL STATEMENTS	CONSOLIDATED FINANCIAL STATEMENTS The accompanying unaudited consolidated financial statements have been prepared by management in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments consisting of normal recurring adjustments considered necessary for the fair presentation of results for the interim period have been included. The Company's operations are seasonal; for this and other reasons, financial results for any interim period are not necessarily indicative of the results expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in our annual Form 10-K for the year ended December 31, 2018. The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

Recent Accounting Pronouncements (Notes)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

RECENT ACCOUNTING PRONOUNCEMENTS

Recent Accounting Pronouncements Adopted



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

Recent Accounting Pronouncements Not Yet Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326)	The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2020

Accounts Receivable, Net

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

Accounts receivable consists of the following (in thousands):



	June 30, 2019			December 31, 2018
Trade accounts receivable	$	164,429		$	124,609
Costs in excess of billings	23,562			22,634
Total accounts receivables	187,991			147,243
Less allowance for doubtful accounts	(7,290		)	(6,960		)
Accounts receivable	$	180,701		$	140,283

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

Revenue Revenue

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Sales includes revenue from contracts with customers for roof and foundation ventilation products; centralized mail systems and electronic package solutions; rain dispersion products and roofing accessories; expanded and perforated metal; perimeter security solutions; expansion joints and structural bearings; 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 services to a customer in an amount that reflects the consideration the Company expects to be entitled in exchange for transferring those products or services. Refer to Note 16 of this quarterly report on Form 10-Q for additional information related to revenue recognized by timing of transfer of control by reportable segment.

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

Contract assets and contract liabilities

Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue. Unearned revenue relates to payments received in advance of performance under the contract and is recognized when the Company performs under the contract. Unearned revenue is presented within accrued expenses in the Company's consolidated balance sheet.

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



	June 30, 2019			December 31, 2018
Costs in excess of billings	$	23,562		$	22,634
Billings in excess of cost	(38,133		)	(17,857		)
Unearned revenue	(9,971		)	(12,028		)



	Six Months Ended June 30, 2019		Six Months Ended June 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	11,357	$	9,044
Amounts included in unearned revenue at the beginning of the period	$	6,153	$	2,581

Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following (in thousands):



	June 30, 2019		December 31, 2018
Raw material	$	49,162	$	57,845
Work-in-process	8,746		6,930
Finished goods	27,490		34,138
Total inventories	$	85,398	$	98,913

Acquisitions

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

ACQUISITIONS

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

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

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



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

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



	Fair Value		Estimated Useful Life
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

During the three and six month periods ended June 30, 2019, the Company incurred $4 thousand of acquisition-related costs. The Company did not incur any acquisition-related costs during the first half of 2018.

Goodwill and Related Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND RELATED INTANGIBLE ASSETS

Goodwill

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



	Residential Products		Industrial and Infrastructure Products		Renewable Energy & Conservation			Total
Balance at December 31, 2018	$	198,075	$	53,769	$	71,827		$	323,671
Adjustments to prior year acquisitions	—		—		(172		)	(172		)
Foreign currency translation	—		229		291			520
Balance at June 30, 2019	$	198,075	$	53,998	$	71,946		$	324,019

Acquired Intangible Assets

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



	June 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	43,870	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,134		3,820		6,094		3,518		3 to 15 Years
Unpatented technology	28,644		14,823		28,644		13,881		5 to 20 Years
Customer relationships	70,690		38,053		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,361		1,649		1,224		4 to 10 Years
	107,117		58,057		106,806		54,301
Total acquired intangible assets	$	150,987	$	58,057	$	150,676	$	54,301

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Amortization expense	$	1,797	$	2,148	$	3,594	$	4,287

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



	2019		2020		2021		2022		2023		2024
Amortization expense	$	3,593	$	6,894	$	6,700	$	6,221	$	5,683	$	5,428

Long-Term Debt	6 Months Ended
Long-Term Debt	Jun. 30, 2019
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT As of June 30, 2019, the Company did not have any long-term debt outstanding. At December 31, 2018, the Company's total outstanding debt was $210.4 million, which included $210.0 million of Senior Subordinated 6.25% Notes and $2.0 million of other debt, net of $1.6 million in unamortized debt issuance costs. $208.8 million of total debt at December 31, 2018 was included in current liabilities. Senior Credit Agreement On January 24, 2019, the Company entered into a Sixth Amended and Restated Credit Agreement ("2019 Senior Credit Agreement"), which amends and restates the Company’s Fifth Amended and Restated Credit Agreement dated December 9, 2015, and provides for a revolving credit facility and letters of credit in an aggregate amount equal to $400 million. The Company can request additional financing from the lenders to increase the revolving credit facility to $700 million or enter into a term loan of up to $300 million subject to conditions set forth in the Senior Credit Agreement. The 2019 Senior Credit Agreement contains three financial covenants. As of June 30, 2019, the Company is in compliance with all three covenants. Borrowings under the 2019 Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and general intangibles of the Company’s significant domestic subsidiaries. Standby letters of credit of $6.0 million have been issued under the 2019 Senior Credit Agreement on behalf of the Company as of June 30, 2019. These letters of credit reduce the amount otherwise available under the revolving credit facility. As of June 30, 2019, the Company had $394.0 million of availability under the revolving credit facility. No borrowings were outstanding under the Company's revolving credit facility at June 30, 2019 and December 31, 2018. Senior Subordinated Notes On January 31, 2013, the Company issued $210 million of 6.25% Senior Subordinated Notes ("Notes") due February 1, 2021. On December 20, 2018, the Company announced its redemption of its $210 million outstanding Notes, effective February 1, 2019. The Notes were redeemed in accordance with the provisions of the indenture governing the Notes on February 1, 2019. The Company recorded a charge of $1.1 million for the write-off of deferred financing fees relating to the Notes during the six months ended June 30, 2019.

Accumulated Other Comprehensive (Loss) Income

6 Months Ended

Jun. 30, 2019

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

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

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



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939	)	$	(2,040	)	$	(7,979	)	$	(745	)	$	(7,234	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)



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

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

Equity-Based Compensation

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

EQUITY-BASED COMPENSATION

On May 4, 2018, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Plan"). The 2018 Plan provides for the issuance of up to 1,000,000 shares of common stock and supplements the remaining shares available for issuance under the existing Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "2015 Plan"). Both the 2018 Plan and the 2015 Plan allow the Company to grant equity-based incentive compensation awards, in the form of non-qualified options, restricted shares, restricted stock units, performance shares, performance stock units, and stock rights to eligible participants.

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

Equity Based Awards - Settled in Stock

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



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	145,420	$	40.55	132,288	$	33.35
Restricted stock units	117,821	$	39.37	69,055	$	33.41
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

(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, 2019.

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

Equity Based Awards - Settled in Cash

The Company's equity-based liability includes awards under a management stock purchase plan. As of June 30, 2019, the Company's total share-based liabilities recorded on the consolidated balance sheet were $26.1 million, of which $21.5 million was included in non-current liabilities. The share-based liabilities as of December 31, 2018 were $38.4 million, of which $23.6 million was included in non-current liabilities.

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

Management Stock Purchase Plan

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

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

The following table provides the number of restricted stock units credited to active participant accounts and the payments made with respect to restricted stock units issued under the MSPP during the six months ended June 30,:



	2019		2018
Restricted stock units credited	55,513		69,514
Share-based liabilities paid (in thousands)	$	5,742	$	4,717

Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, various techniques and assumptions can be used to estimate fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement as follows:


•	Level 1 - Quoted prices in active markets for identical assets or liabilities.


•	Level 2 - Observable inputs other than quoted prices in active markets for similar assets and liabilities.


•	Level 3 - Inputs that are unobservable inputs for the asset or liability.

The Company had no financial assets or liabilities measured at fair value on a recurring basis at June 30, 2019 and December 31, 2018. As of June 30, 2019, the Company does not have any financial instrument for which the carrying value differs from its fair value. At December 31, 2018, the Company's only financial instrument for which the carrying value differs from its fair value was the Company's Senior Subordinated 6.25% Notes, which were redeemed on February 1, 2019. At December 31, 2018, the fair value of the outstanding debt, net of unamortized debt issuance costs, was $210.8 million compared to its carrying value of $210.4 million.

- Definition

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

+ References + Details

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

LEASES

The Company's leases are classified as operating leases and consist of manufacturing facilities, distribution centers, office space, vehicles and equipment. For leases with terms greater than twelve months, at lease commencement the Company recognizes a right-of-use asset and a lease liability. The initial lease liability is recognized at the present value of remaining lease payments over the lease term. Leases with an initial term of twelve months or less are not recorded on the Company's consolidated balance sheet. The Company recognizes lease expense for operating leases on a straight-line basis over the lease term. The Company combines lease and non-lease components, such as common area maintenance costs, in calculating the related asset and lease liabilities for all underlying asset groups. Operating lease cost is included in income from operations and includes short-term leases and variable lease costs which are immaterial.

Most of the Company's leases include one or more options to renew, with renewal terms that can extend the respective lease term from one month to fifteen years. The exercise of lease renewal options is at the Company's sole discretion. As of June 30, 2019, the Company's renewal options are not part of the Company's operating lease assets and operating lease liabilities. Certain leases also include options to purchase at fair value the underlying leased asset at the Company's sole discretion.



(In thousands)	Classification	June 30, 2019
Assets	Operating lease assets	$	30,029

Liabilities
Current	Accrued expenses	$	8,958
Non-current	Non-current operating lease liabilities	21,375
		$	30,333



Lease cost (in thousands)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	3,190	$	6,547



Other information (in thousands)	Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	5,461
Right-of-use assets obtained in exchange for new lease liabilities	$	4,274



Lease Term and Discount Rate	June 30, 2019
Weighted-average remaining lease term - operating leases	4.22		years
Weighted-average discount rate - operating leases	5.76	%



Maturity of lease liabilities	(In thousands)
2019 (July 1, 2019 through December 31, 2019)	$	5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933		)
Present value of lease liabilities	$	30,333

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

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

Exit Activity Costs and Asset Impairments

6 Months Ended

Jun. 30, 2019

Restructuring and Related Activities [Abstract]

EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS

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

Exit activity costs were incurred during the six months ended June 30, 2019 which related to contract terminations, moving and closing costs, and severance incurred as a result of process simplification initiatives. No facilities were closed during the six months ended June 30, 2019.

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

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



	Three months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	219		$	219		$	—	$	(29	)	$	(29	)
Industrial and Infrastructure Products	—		1,346			1,346			—		(28		)	(28		)
Renewable Energy and Conservation	—		(95		)	(95		)	65		(68		)	(3		)
Corporate	—		666			666			—		223			223
Total exit activity costs & asset impairments	$	—	$	2,136		$	2,136		$	65	$	98		$	163



	Six months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	370		$	370		$	(43	)	$	(152	)	$	(195	)
Industrial and Infrastructure Products	—		1,313			1,313			(703		)	190			(513		)
Renewable Energy and Conservation	—		(1		)	(1		)	84			49			133
Corporate	—		673			673			—			267			267
Total exit activity costs & asset impairments	$	—	$	2,355		$	2,355		$	(662	)	$	354		$	(308	)

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



	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Cost of sales	$	319	$	(193	)	$	285	$	(156	)
Selling, general, and administrative expense	1,817		356			2,070		(152		)
Net asset impairment and exit activity charges (recoveries)	$	2,136	$	163		$	2,355	$	(308	)

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	2,355			354
Cash payments	(1,329		)	(1,256		)
Balance at June 30	$	2,949		$	59

Income Taxes

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,487		$	6,294		$	8,058		$	9,101
Effective tax rate	24.6		%	21.6		%	23.5		%	22.6		%

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

Earnings per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	19,913	$	22,837	$	26,258	$	31,189
Denominator for basic earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Common stock options and stock units	321		691		330		674
Weighted average shares and conversions	32,642		32,553		32,630		32,498

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 366,000 and 377,000 for the three months ended June 30, 2019 and 2018, respectively, and 312,000 and 368,000 for the six months ended June 30, 2019 and 2018, respectively.

Segment Information

6 Months Ended

Jun. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

SEGMENT INFORMATION

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


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


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


(iii)	Renewable Energy and Conservation, which primarily includes designing, engineering, manufacturing and installation of solar racking and electrical balance of 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 June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Net sales:
Residential Products	$	130,433		$	131,128		$	234,142		$	235,076
Industrial and Infrastructure Products	56,547			61,561			111,735			116,185
Less: Intersegment sales	(329		)	(368		)	(646		)	(589		)
Net Industrial and Infrastructure Products	56,218			61,193			111,089			115,596
Renewable Energy and Conservation	76,004			73,715			144,841			130,701
Total consolidated net sales	$	262,655		$	266,036		$	490,072		$	481,373

Income from operations:
Residential Products	$	20,778		$	24,196		$	32,868		$	37,434
Industrial and Infrastructure Products	4,069			6,604			8,198			9,206
Renewable Energy and Conservation	9,649			9,556			11,281			13,618
Unallocated Corporate Expenses	(7,890		)	(8,082		)	(15,175		)	(14,141		)
Total consolidated income from operations	$	26,606		$	32,274		$	37,172		$	46,117

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, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	129,566	$	46,315	$	8,469	$	184,350
Over Time	867		9,903		67,535		78,305
Total net sales	$	130,433	$	56,218	$	76,004	$	262,655



	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 net sales	$	131,128	$	61,193	$	73,715	$	266,036



	Six Months Ended June 30, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	232,458	$	91,602	$	15,759	$	339,819
Over Time	1,684		19,487		129,082		150,253
Total net sales	$	234,142	$	111,089	$	144,841	$	490,072



	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 net sales	$	235,076	$	115,596	$	130,701	$	481,373

Recent Accounting Pronouncements (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted



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

Recent Accounting Pronouncements Not Yet Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326)	The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2020

Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):



	June 30, 2019			December 31, 2018
Trade accounts receivable	$	164,429		$	124,609
Costs in excess of billings	23,562			22,634
Total accounts receivables	187,991			147,243
Less allowance for doubtful accounts	(7,290		)	(6,960		)
Accounts receivable	$	180,701		$	140,283

Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability



	June 30, 2019			December 31, 2018
Costs in excess of billings	$	23,562		$	22,634
Billings in excess of cost	(38,133		)	(17,857		)
Unearned revenue	(9,971		)	(12,028		)



	Six Months Ended June 30, 2019		Six Months Ended June 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	11,357	$	9,044
Amounts included in unearned revenue at the beginning of the period	$	6,153	$	2,581

Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Schedule Of Inventories

Inventories consist of the following (in thousands):



	June 30, 2019		December 31, 2018
Raw material	$	49,162	$	57,845
Work-in-process	8,746		6,930
Finished goods	27,490		34,138
Total inventories	$	85,398	$	98,913

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Allocation Of Purchase Consideration To The Assets Acquired And Liabilities Assumed

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



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

Intangible Assets Acquired

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



	Fair Value		Estimated Useful Life
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

Goodwill and Related Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Changes In Carrying Amount Of Goodwill

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



	Residential Products		Industrial and Infrastructure Products		Renewable Energy & Conservation			Total
Balance at December 31, 2018	$	198,075	$	53,769	$	71,827		$	323,671
Adjustments to prior year acquisitions	—		—		(172		)	(172		)
Foreign currency translation	—		229		291			520
Balance at June 30, 2019	$	198,075	$	53,998	$	71,946		$	324,019

Schedule Of Acquired Intangible Assets

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



	June 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	43,870	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,134		3,820		6,094		3,518		3 to 15 Years
Unpatented technology	28,644		14,823		28,644		13,881		5 to 20 Years
Customer relationships	70,690		38,053		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,361		1,649		1,224		4 to 10 Years
	107,117		58,057		106,806		54,301
Total acquired intangible assets	$	150,987	$	58,057	$	150,676	$	54,301

Schedule of Acquired Intangible Asset Amortization Expense

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Amortization expense	$	1,797	$	2,148	$	3,594	$	4,287

Schedule Of Amortization Expense

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



	2019		2020		2021		2022		2023		2024
Amortization expense	$	3,593	$	6,894	$	6,700	$	6,221	$	5,683	$	5,428

Accumulated Other Comprehensive (Loss) Income (Tables)

6 Months Ended

Jun. 30, 2019

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

Schedule Of Components Of Accumulated Other Comprehensive Loss

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



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939	)	$	(2,040	)	$	(7,979	)	$	(745	)	$	(7,234	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)



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

Equity-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

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



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	145,420	$	40.55	132,288	$	33.35
Restricted stock units	117,821	$	39.37	69,055	$	33.41
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

Management Stock Purchase Plan



	2019		2018
Restricted stock units credited	55,513		69,514
Share-based liabilities paid (in thousands)	$	5,742	$	4,717

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Assets And Liabilities, Lessee



(In thousands)	Classification	June 30, 2019
Assets	Operating lease assets	$	30,029

Liabilities
Current	Accrued expenses	$	8,958
Non-current	Non-current operating lease liabilities	21,375
		$	30,333

Lease, Cost



Lease cost (in thousands)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	3,190	$	6,547



Other information (in thousands)	Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	5,461
Right-of-use assets obtained in exchange for new lease liabilities	$	4,274



Lease Term and Discount Rate	June 30, 2019
Weighted-average remaining lease term - operating leases	4.22		years
Weighted-average discount rate - operating leases	5.76	%

Lessee, Operating Lease, Liability, Maturity



Maturity of lease liabilities	(In thousands)
2019 (July 1, 2019 through December 31, 2019)	$	5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933		)
Present value of lease liabilities	$	30,333

Exit Activity Costs and Asset Impairments (Tables)

6 Months Ended

Jun. 30, 2019

Restructuring and Related Activities [Abstract]

Summary Of Exit Activity Costs And Asset Impairments



	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Cost of sales	$	319	$	(193	)	$	285	$	(156	)
Selling, general, and administrative expense	1,817		356			2,070		(152		)
Net asset impairment and exit activity charges (recoveries)	$	2,136	$	163		$	2,355	$	(308	)



	Three months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	219		$	219		$	—	$	(29	)	$	(29	)
Industrial and Infrastructure Products	—		1,346			1,346			—		(28		)	(28		)
Renewable Energy and Conservation	—		(95		)	(95		)	65		(68		)	(3		)
Corporate	—		666			666			—		223			223
Total exit activity costs & asset impairments	$	—	$	2,136		$	2,136		$	65	$	98		$	163



	Six months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	370		$	370		$	(43	)	$	(152	)	$	(195	)
Industrial and Infrastructure Products	—		1,313			1,313			(703		)	190			(513		)
Renewable Energy and Conservation	—		(1		)	(1		)	84			49			133
Corporate	—		673			673			—			267			267
Total exit activity costs & asset impairments	$	—	$	2,355		$	2,355		$	(662	)	$	354		$	(308	)

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

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	2,355			354
Cash payments	(1,329		)	(1,256		)
Balance at June 30	$	2,949		$	59

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Summary Of Provision For Income Taxes For Continuing Operations

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,487		$	6,294		$	8,058		$	9,101
Effective tax rate	24.6		%	21.6		%	23.5		%	22.6		%

Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule Of Computation Of Basic And Diluted Loss Per Share

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	19,913	$	22,837	$	26,258	$	31,189
Denominator for basic earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Common stock options and stock units	321		691		330		674
Weighted average shares and conversions	32,642		32,553		32,630		32,498

Segment Information (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Reconciliation Of Sales To Earnings Before Income Taxes by Segment

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Net sales:
Residential Products	$	130,433		$	131,128		$	234,142		$	235,076
Industrial and Infrastructure Products	56,547			61,561			111,735			116,185
Less: Intersegment sales	(329		)	(368		)	(646		)	(589		)
Net Industrial and Infrastructure Products	56,218			61,193			111,089			115,596
Renewable Energy and Conservation	76,004			73,715			144,841			130,701
Total consolidated net sales	$	262,655		$	266,036		$	490,072		$	481,373

Income from operations:
Residential Products	$	20,778		$	24,196		$	32,868		$	37,434
Industrial and Infrastructure Products	4,069			6,604			8,198			9,206
Renewable Energy and Conservation	9,649			9,556			11,281			13,618
Unallocated Corporate Expenses	(7,890		)	(8,082		)	(15,175		)	(14,141		)
Total consolidated income from operations	$	26,606		$	32,274		$	37,172		$	46,117

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, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	129,566	$	46,315	$	8,469	$	184,350
Over Time	867		9,903		67,535		78,305
Total net sales	$	130,433	$	56,218	$	76,004	$	262,655



	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 net sales	$	131,128	$	61,193	$	73,715	$	266,036



	Six Months Ended June 30, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	232,458	$	91,602	$	15,759	$	339,819
Over Time	1,684		19,487		129,082		150,253
Total net sales	$	234,142	$	111,089	$	144,841	$	490,072



	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 net sales	$	235,076	$	115,596	$	130,701	$	481,373

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 366,835		$ 338,995
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 1,600

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade accounts receivable	$ 164,429	$ 124,609
Costs in excess of billings	23,562	22,634
Total accounts receivables	187,991	147,243
Less allowance for doubtful accounts	(7,290)	(6,960)
Accounts receivable	$ 180,701	$ 140,283

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

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Costs in excess of billings	$ 23,562		$ 22,634
Amounts included in billings in excess of cost at the beginning of the period	11,357	$ 9,044
Amounts included in unearned revenue at the beginning of the period	6,153	$ 2,581
Billings in excess of cost
Capitalized Contract Cost [Line Items]
Contract with customer liability	(38,133)		(17,857)
Unearned revenue
Capitalized Contract Cost [Line Items]
Contract with customer liability	$ (9,971)		$ (12,028)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw material	$ 49,162	$ 57,845
Work-in-process	8,746	6,930
Finished goods	27,490	34,138
Total inventories	$ 85,398	$ 98,913

Acquisitions (Narrative) (Details) - USD ($)		3 Months Ended	6 Months Ended
Acquisitions (Narrative) (Details) - USD ($)	Aug. 21, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 324,019,000	$ 324,019,000		$ 323,671,000
SolarBOS
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 6,400,000
Goodwill	$ 2,879,000
Acquisition related costs		$ 4,000	$ 4,000	$ 0

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Aug. 21, 2018
Business Acquisition [Line Items]
Goodwill	$ 324,019	$ 323,671
SolarBOS
Business Acquisition [Line Items]
Cash			$ 915
Working capital			680
Property, plant and equipment			483
Acquired intangible assets			1,450
Other assets			13
Other liabilities			(51)
Goodwill			2,879
Fair value of purchase consideration			$ 6,369

Acquisitions (Schedule of Acquired Intangible Assets) (Details) - SolarBOS $ in Thousands	Aug. 21, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 1,450
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 300
Estimated Useful Life	3 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 450
Estimated Useful Life	9 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 700
Estimated Useful Life	9 years

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2018	$ 323,671
Adjustments to prior year acquisitions	(172)
Foreign currency translation	520
Balance at June 30, 2019	324,019
Residential Products
Goodwill [Roll Forward]
Balance at December 31, 2018	198,075
Adjustments to prior year acquisitions	0
Foreign currency translation	0
Balance at June 30, 2019	198,075
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at December 31, 2018	53,769
Adjustments to prior year acquisitions	0
Foreign currency translation	229
Balance at June 30, 2019	53,998
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at December 31, 2018	71,827
Adjustments to prior year acquisitions	(172)
Foreign currency translation	291
Balance at June 30, 2019	$ 71,946

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 107,117	$ 106,806
Total acquired intangible assets, Gross Carrying Amount	150,987	150,676
Accumulated Amortization, Finite-lived intangible assets	58,057	54,301
Total acquired intangible assets, Accumulated Amortization	58,057	54,301
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	6,134	6,094
Accumulated Amortization, Finite-lived intangible assets	3,820	3,518
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	28,644	28,644
Accumulated Amortization, Finite-lived intangible assets	14,823	13,881
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	70,690	70,419
Accumulated Amortization, Finite-lived intangible assets	38,053	35,678
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,649	1,649
Accumulated Amortization, Finite-lived intangible assets	1,361	1,224
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	43,870	43,870
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0
Minimum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	3 years
Minimum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	4 years
Maximum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	15 years
Maximum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	20 years
Maximum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	17 years
Maximum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	10 years

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,797	$ 2,148	$ 3,594	$ 4,287
2019	3,593		3,593
2020	6,894		6,894
2021	6,700		6,700
2022	6,221		6,221
2023	5,683		5,683
2024	$ 5,428		$ 5,428

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

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (7,121)	$ (7,979)	$ (5,539)	$ (5,336)	$ (7,979)	$ (5,336)
Accumulated other comprehensive income, tax, beginning balance	(741)	(745)	(960)	(970)	(745)	(970)
Accumulated Other Comprehensive Income Beginning Balance	(6,380)	(7,234)	(4,579)	(4,366)	(7,234)	(4,366)
Cumulative effect of new accounting principle in period of adoption							$ 1,582	$ 274
Other comprehensive income (loss), net of tax	1,010		(1,761)		1,864	(1,974)
AOCI before tax, ending balance	(6,106)	(7,121)	(7,289)	(5,539)	(6,106)	(7,289)
Accumulated other comprehensive income, tax, ending balance	(736)	(741)	(949)	(960)	(736)	(949)
Accumulated Other Comprehensive Income Ending Balance	(5,370)	(6,380)	(6,340)	(4,579)	(5,370)	(6,340)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(5,097)	(5,939)	(2,588)	(2,698)	(5,939)	(2,698)
Other comprehensive income adjustments	998	842	(1,787)	110
Other comprehensive income (loss), net of tax	998	842	(1,787)	110
AOCI before tax, ending balance	(4,099)	(5,097)	(4,375)	(2,588)	(4,099)	(4,375)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	17	16	37	37
Other comprehensive income (loss), tax	5	4	11	10
Other comprehensive income (loss), net of tax	12	12	26	27
Minimum pension and post retirement benefit plan adjustments \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,024)	(2,040)	(2,951)	(2,638)	(2,040)	(2,638)
Other comprehensive income adjustments	17	16	37	37
AOCI before tax, ending balance	$ (2,007)	$ (2,024)	$ (2,914)	$ (2,951)	$ (2,007)	$ (2,914)
Accounting Standards Update 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption								$ (350)

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

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	1 Months Ended		6 Months Ended
	Feb. 29, 2020	Feb. 28, 2017	Jun. 30, 2019	Jun. 30, 2018
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			145,420	132,288
Weighted average grant date fair value (in USD per share)			$ 40.55	$ 33.35
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			117,821	69,055
Weighted average grant date fair value (in USD per share)			$ 39.37	$ 33.41
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			7,509	10,255
Weighted average grant date fair value (in USD per share)			$ 37.95	$ 35.96
Common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			7,509	2,113
Weighted average grant date fair value (in USD per share)			$ 37.95	$ 35.50
2015 Incentive Plan \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion as percentage of total award		95.50%
2015 Incentive Plan \| Scenario, Forecast \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion (in shares)	126,337

Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 26.1	$ 38.4
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target performance stock units earned	200.00%
Units converted (in shares)	256,000
Closing period	90 days
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 21.5	$ 23.6
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs compensation expense	$ 8.9

Equity-Based Compensation (Management Stock Purchase Plan) (Details) - Management Stock Purchase Plan - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based liabilities paid (in thousands)	$ 5,742,000	$ 4,717,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units credited (in shares)	$ 55,513	$ 69,514

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

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

Leases - Assets and Liabilities of Lessee (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease assets	$ 30,029
Accrued expenses	8,958
Non-current operating lease liabilities	21,375
Total operating lease liability	$ 30,333

Leases - Schedule of Lease Cost and Assumptions (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 3,190	$ 6,547
Cash paid for amounts included in the measurement of operating liabilities		5,461
Right-of-use assets obtained in exchange for new lease liabilities		$ 4,274
Weighted-average remaining lease term - operating leases	4 years 2 months 19 days	4 years 2 months 19 days
Weighted-average discount rate - operating leases	5.76%	5.76%

Leases - Maturity of Lease Payments (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
2019 (July 1, 2019 through December 31, 2019)	$ 5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933)
Present value of lease liabilities	$ 30,333

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

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	$ 0	$ 65	$ 0	$ (662)
Exit activity costs (recoveries), net	2,136	98	2,355	354
Total exit activity costs & asset impairments	2,136	163	2,355	(308)
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	(43)
Exit activity costs (recoveries), net	219	(29)	370	(152)
Total exit activity costs & asset impairments	219	(29)	370	(195)
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	(703)
Exit activity costs (recoveries), net	1,346	(28)	1,313	190
Total exit activity costs & asset impairments	1,346	(28)	1,313	(513)
Renewable Energy and Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	65	0	84
Exit activity costs (recoveries), net	(95)	(68)	(1)	49
Total exit activity costs & asset impairments	(95)	(3)	(1)	133
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	0
Exit activity costs (recoveries), net	666	223	673	267
Total exit activity costs & asset impairments	$ 666	$ 223	$ 673	$ 267

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 2,136	$ 163	$ 2,355	$ (308)
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	319	(193)	285	(156)
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,817	$ 356	$ 2,070	$ (152)

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance			$ 1,923	$ 961
Exit activity costs (recoveries), net	$ 2,136	$ 98	2,355	354
Cash payments			(1,329)	(1,256)
Ending balance	$ 2,949	$ 59	$ 2,949	$ 59

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 6,487	$ 6,294	$ 8,058	$ 9,101
Effective tax rate	24.60%	21.60%	23.50%	22.60%

Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
Earnings per Share (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 19,913	$ 6,345	$ 22,837	$ 8,352	$ 26,258	$ 31,189
Weighted average basic shares outstanding (in shares)	32,321,000		31,862,000		32,300,000	31,824,000
Common stock options and restricted stock (in shares)	321,000		691,000		330,000	674,000
Weighted average shares outstanding, diluted (in shares)	32,642,000		32,553,000		32,630,000	32,498,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	366,000		377,000		312,000	368,000

- Definition

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

+ References + Details

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments \| segment			3
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Income from operations:	63,558	70,503	107,458	118,821
Unallocated Corporate Expenses	(7,890)	(8,082)	(15,175)	(14,141)
Total consolidated income from operations	26,606	32,274	37,172	46,117
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	130,433	131,128	234,142	235,076
Income from operations:	20,778	24,196	32,868	37,434
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	56,218	61,193	111,089	115,596
Income from operations:	4,069	6,604	8,198	9,206
Renewable Energy & Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	76,004	73,715	144,841	130,701
Income from operations:	9,649	9,556	11,281	13,618
Operating Segments \| Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	130,433	131,128
Operating Segments \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	56,547	61,561
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ (329)	$ (368)	(646)	(589)
Intersegment Elimination \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:			$ 111,735	$ 116,185

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	130,433	131,128	234,142	235,076
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	56,218	61,193	111,089	115,596
Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	76,004	73,715	144,841	130,701
Point in Time
Disaggregation of Revenue [Line Items]
Net sales:	184,350	191,110	339,819	346,157
Point in Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	129,566	130,958	232,458	233,842
Point in Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	46,315	51,428	91,602	97,971
Point in Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	8,469	8,724	15,759	14,344
Over Time
Disaggregation of Revenue [Line Items]
Net sales:	78,305	74,926	150,253	135,216
Over Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	867	170	1,684	1,234
Over Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	9,903	9,765	19,487	17,625
Over Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	$ 67,535	$ 64,991	$ 129,082	$ 116,357

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (350,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	624,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,582,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2019	Jul. 24, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	0-22462
Entity Registrant Name	GIBRALTAR INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1445150
Entity Address, Address Line One	3556 Lake Shore Road
Entity Address, Address Line Two	P.O. Box 2028
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14219-0228
City Area Code	716
Local Phone Number	826-6500
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	ROCK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,224,233
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000912562
Current Fiscal Year End Date	--12-31

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Cost of sales	199,097	195,533	382,614	362,552
Gross profit	63,558	70,503	107,458	118,821
Selling, general, and administrative expense	36,952	38,229	70,286	72,704
Income from operations	26,606	32,274	37,172	46,117
Interest expense	219	3,130	2,280	6,399
Other (income) expense	(13)	13	576	(572)
Income before taxes	26,400	29,131	34,316	40,290
Provision for income taxes	6,487	6,294	8,058	9,101
Net income	$ 19,913	$ 22,837	$ 26,258	$ 31,189
Net earnings per share – Basic:
Income from continuing operations - Net earnings per share - Basic (in USD per share)	$ 0.62	$ 0.72	$ 0.81	$ 0.98
Income from continuing operations - Net earnings per share - Diluted (in USD per share)	$ 0.61	$ 0.70	$ 0.80	$ 0.96
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	32,321	31,862	32,300	31,824
Weighted average shares outstanding, diluted (in shares)	32,642	32,553	32,630	32,498

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 19,913	$ 22,837	$ 26,258	$ 31,189
Other comprehensive income (loss):
Foreign currency translation adjustment	998	(1,787)	1,840	(1,677)
Cumulative effect of accounting change	0	0	0	(350)
Minimum pension and post retirement benefit plan adjustments	12	26	24	53
Other comprehensive income (loss)	1,010	(1,761)	1,864	(1,974)
Total comprehensive income	$ 20,923	$ 21,076	$ 28,122	$ 29,215

- Definition

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

+ References + Details

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 81,882	$ 297,006
Accounts receivable, net	180,701	140,283
Inventories	85,398	98,913
Other current assets	13,264	8,351
Total current assets	361,245	544,553
Property, plant, and equipment, net	95,867	95,830
Operating lease assets	30,029
Goodwill	324,019	323,671
Acquired intangibles	92,930	96,375
Other assets	2,768	1,216
Total assets	906,858	1,061,645
Current liabilities:
Accounts payable	83,140	79,136
Accrued expenses	66,980	87,074
Billings in excess of cost	38,133	17,857
Current maturities of long-term debt	0	208,805
Total current liabilities	188,253	392,872
Long-term debt	0	1,600
Deferred income taxes	37,380	36,530
Non-current operating lease liabilities	21,375
Other non-current liabilities	30,303	33,950
Shareholders’ equity:
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding	0	0
Common stock, $0.01 par value; authorized 50,000 shares; 33,101 shares and 32,887 shares issued and outstanding in 2019 and 2018	331	329
Additional paid-in capital	288,822	282,525
Retained earnings	366,835	338,995
Accumulated other comprehensive loss	(5,370)	(7,234)
Cost of 880 and 796 common shares held in treasury in 2019 and 2018	(21,071)	(17,922)
Total shareholders’ equity	629,547	596,693
Total liabilities and shareholders' equity	$ 906,858	$ 1,061,645

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	33,101,000	32,887,000
Treasury stock, shares (in shares)	880,000	796,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities
Net income	$ 26,258	$ 31,189
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	9,892	10,345
Stock compensation expense	6,091	4,828
Exit activity recoveries, non-cash	0	(662)
Provision for deferred income taxes	278	0
Other, net	2,437	657
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(41,156)	(22,048)
Inventories	13,464	(14,985)
Other current assets and other assets	(4,983)	(2,840)
Accounts payable	4,012	6,064
Accrued expenses and other non-current liabilities	(9,807)	(16,351)
Net cash provided by (used in) operating activities	6,486	(3,803)
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(264)	0
Net proceeds from sale of property and equipment	60	2,929
Purchases of property, plant, and equipment	(6,265)	(3,704)
Net cash used in investing activities	(6,469)	(775)
Cash Flows from Financing Activities
Long-term debt payments	(212,000)	(400)
Payment of debt issuance costs	(1,235)	0
Purchase of treasury stock at market prices	(3,149)	(6,016)
Net proceeds from issuance of common stock	208	526
Net cash used in financing activities	(216,176)	(5,890)
Effect of exchange rate changes on cash	1,035	(1,069)
Net decrease in cash and cash equivalents	(215,124)	(11,537)
Cash and cash equivalents at beginning of year	297,006	222,280
Cash and cash equivalents at end of period	$ 81,882	$ 210,743

Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, shares at Dec. 31, 2017		32,332				615
Balance, value at Dec. 31, 2017	$ 531,719	$ 323	$ 271,957	$ 274,562	$ (4,366)	$ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,352			8,352
Foreign currency translation adjustment	110				110
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	27				27
Stock compensation expense	2,097		2,097
Stock options exercised, shares		13
Stock options exercised	226	$ 0	226
Net settlement of restricted stock units, shares		53				24
Net settlement of restricted stock units	(850)	$ 1	(1)			$ (850)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
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)
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)
Balance, shares at Mar. 31, 2018		32,398				639
Balance, value at Mar. 31, 2018	541,955	$ 324	274,279	283,538	(4,579)	$ (11,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,837
Foreign currency translation adjustment	(1,787)				(1,787)
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	26				26
Stock compensation expense	2,731		2,731
Stock options exercised, shares		21
Stock options exercised	$ 300		300
Awards of common shares (in shares)	2
Net settlement of restricted stock units, shares		334				128
Net settlement of restricted stock units	$ (5,166)	$ 3	(3)			$ (5,166)
Balance, shares at Jun. 30, 2018		32,755				767
Balance, value at Jun. 30, 2018	560,896	$ 327	277,307	306,375	(6,340)	$ (16,773)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,345
Foreign currency translation adjustment	842				842
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	2,371		2,371
Stock options exercised, shares		12
Stock options exercised	139		139
Net settlement of restricted stock units, shares		127				59
Net settlement of restricted stock units	(2,151)	$ 1	(1)			$ (2,151)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	596,693	$ 329	282,525	338,995	(7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,258
Foreign currency translation adjustment	1,840
Balance, shares at Jun. 30, 2019		33,101				880
Balance, value at Jun. 30, 2019	629,547	$ 331	288,822	366,835	(5,370)	$ (21,071)
Balance, shares at Mar. 31, 2019		33,026				855
Balance, value at Mar. 31, 2019	605,833	$ 330	285,034	346,922	(6,380)	$ (20,073)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,913
Foreign currency translation adjustment	998				998
Minimum pension and post retirement benefit plan adjustments, net of taxes of $4	12				12
Stock compensation expense	3,720		3,720
Stock options exercised, shares		5
Stock options exercised	$ 69		69
Awards of common shares (in shares)	8
Net settlement of restricted stock units, shares		62				25
Net settlement of restricted stock units	$ (998)	$ 1	(1)			$ (998)
Balance, shares at Jun. 30, 2019		33,101				880
Balance, value at Jun. 30, 2019	$ 629,547	$ 331	$ 288,822	$ 366,835	$ (5,370)	$ (21,071)

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

Consolidated Financial Statements	6 Months Ended
Consolidated Financial Statements	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CONSOLIDATED FINANCIAL STATEMENTS	CONSOLIDATED FINANCIAL STATEMENTS The accompanying unaudited consolidated financial statements have been prepared by management in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments consisting of normal recurring adjustments considered necessary for the fair presentation of results for the interim period have been included. The Company's operations are seasonal; for this and other reasons, financial results for any interim period are not necessarily indicative of the results expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in our annual Form 10-K for the year ended December 31, 2018. The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

Recent Accounting Pronouncements (Notes)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

RECENT ACCOUNTING PRONOUNCEMENTS

Recent Accounting Pronouncements Adopted



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

Recent Accounting Pronouncements Not Yet Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326)	The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2020

Accounts Receivable, Net

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

Accounts receivable consists of the following (in thousands):



	June 30, 2019			December 31, 2018
Trade accounts receivable	$	164,429		$	124,609
Costs in excess of billings	23,562			22,634
Total accounts receivables	187,991			147,243
Less allowance for doubtful accounts	(7,290		)	(6,960		)
Accounts receivable	$	180,701		$	140,283

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

Revenue Revenue

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Revenue recognition

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

Contract assets and contract liabilities



	June 30, 2019			December 31, 2018
Costs in excess of billings	$	23,562		$	22,634
Billings in excess of cost	(38,133		)	(17,857		)
Unearned revenue	(9,971		)	(12,028		)



	Six Months Ended June 30, 2019		Six Months Ended June 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	11,357	$	9,044
Amounts included in unearned revenue at the beginning of the period	$	6,153	$	2,581

Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following (in thousands):



	June 30, 2019		December 31, 2018
Raw material	$	49,162	$	57,845
Work-in-process	8,746		6,930
Finished goods	27,490		34,138
Total inventories	$	85,398	$	98,913

Acquisitions

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

ACQUISITIONS

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



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

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



	Fair Value		Estimated Useful Life
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

Goodwill and Related Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND RELATED INTANGIBLE ASSETS

Goodwill

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



	Residential Products		Industrial and Infrastructure Products		Renewable Energy & Conservation			Total
Balance at December 31, 2018	$	198,075	$	53,769	$	71,827		$	323,671
Adjustments to prior year acquisitions	—		—		(172		)	(172		)
Foreign currency translation	—		229		291			520
Balance at June 30, 2019	$	198,075	$	53,998	$	71,946		$	324,019

Acquired Intangible Assets

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



	June 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	43,870	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,134		3,820		6,094		3,518		3 to 15 Years
Unpatented technology	28,644		14,823		28,644		13,881		5 to 20 Years
Customer relationships	70,690		38,053		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,361		1,649		1,224		4 to 10 Years
	107,117		58,057		106,806		54,301
Total acquired intangible assets	$	150,987	$	58,057	$	150,676	$	54,301

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Amortization expense	$	1,797	$	2,148	$	3,594	$	4,287

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



	2019		2020		2021		2022		2023		2024
Amortization expense	$	3,593	$	6,894	$	6,700	$	6,221	$	5,683	$	5,428

Long-Term Debt	6 Months Ended
Long-Term Debt	Jun. 30, 2019
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT As of June 30, 2019, the Company did not have any long-term debt outstanding. At December 31, 2018, the Company's total outstanding debt was $210.4 million, which included $210.0 million of Senior Subordinated 6.25% Notes and $2.0 million of other debt, net of $1.6 million in unamortized debt issuance costs. $208.8 million of total debt at December 31, 2018 was included in current liabilities. Senior Credit Agreement On January 24, 2019, the Company entered into a Sixth Amended and Restated Credit Agreement ("2019 Senior Credit Agreement"), which amends and restates the Company’s Fifth Amended and Restated Credit Agreement dated December 9, 2015, and provides for a revolving credit facility and letters of credit in an aggregate amount equal to $400 million. The Company can request additional financing from the lenders to increase the revolving credit facility to $700 million or enter into a term loan of up to $300 million subject to conditions set forth in the Senior Credit Agreement. The 2019 Senior Credit Agreement contains three financial covenants. As of June 30, 2019, the Company is in compliance with all three covenants. Borrowings under the 2019 Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and general intangibles of the Company’s significant domestic subsidiaries. Standby letters of credit of $6.0 million have been issued under the 2019 Senior Credit Agreement on behalf of the Company as of June 30, 2019. These letters of credit reduce the amount otherwise available under the revolving credit facility. As of June 30, 2019, the Company had $394.0 million of availability under the revolving credit facility. No borrowings were outstanding under the Company's revolving credit facility at June 30, 2019 and December 31, 2018. Senior Subordinated Notes On January 31, 2013, the Company issued $210 million of 6.25% Senior Subordinated Notes ("Notes") due February 1, 2021. On December 20, 2018, the Company announced its redemption of its $210 million outstanding Notes, effective February 1, 2019. The Notes were redeemed in accordance with the provisions of the indenture governing the Notes on February 1, 2019. The Company recorded a charge of $1.1 million for the write-off of deferred financing fees relating to the Notes during the six months ended June 30, 2019.

Accumulated Other Comprehensive (Loss) Income

6 Months Ended

Jun. 30, 2019

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

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

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



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939	)	$	(2,040	)	$	(7,979	)	$	(745	)	$	(7,234	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)



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

Equity-Based Compensation

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

EQUITY-BASED COMPENSATION

Equity Based Awards - Settled in Stock



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	145,420	$	40.55	132,288	$	33.35
Restricted stock units	117,821	$	39.37	69,055	$	33.41
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

Equity Based Awards - Settled in Cash

Management Stock Purchase Plan



	2019		2018
Restricted stock units credited	55,513		69,514
Share-based liabilities paid (in thousands)	$	5,742	$	4,717

Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS


•	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.

- Definition

+ References + Details

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

LEASES



(In thousands)	Classification	June 30, 2019
Assets	Operating lease assets	$	30,029

Liabilities
Current	Accrued expenses	$	8,958
Non-current	Non-current operating lease liabilities	21,375
		$	30,333



Lease cost (in thousands)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	3,190	$	6,547



Other information (in thousands)	Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	5,461
Right-of-use assets obtained in exchange for new lease liabilities	$	4,274



Lease Term and Discount Rate	June 30, 2019
Weighted-average remaining lease term - operating leases	4.22		years
Weighted-average discount rate - operating leases	5.76	%



Maturity of lease liabilities	(In thousands)
2019 (July 1, 2019 through December 31, 2019)	$	5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933		)
Present value of lease liabilities	$	30,333

Exit Activity Costs and Asset Impairments

6 Months Ended

Jun. 30, 2019

Restructuring and Related Activities [Abstract]

EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS



	Three months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	219		$	219		$	—	$	(29	)	$	(29	)
Industrial and Infrastructure Products	—		1,346			1,346			—		(28		)	(28		)
Renewable Energy and Conservation	—		(95		)	(95		)	65		(68		)	(3		)
Corporate	—		666			666			—		223			223
Total exit activity costs & asset impairments	$	—	$	2,136		$	2,136		$	65	$	98		$	163



	Six months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	370		$	370		$	(43	)	$	(152	)	$	(195	)
Industrial and Infrastructure Products	—		1,313			1,313			(703		)	190			(513		)
Renewable Energy and Conservation	—		(1		)	(1		)	84			49			133
Corporate	—		673			673			—			267			267
Total exit activity costs & asset impairments	$	—	$	2,355		$	2,355		$	(662	)	$	354		$	(308	)



	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Cost of sales	$	319	$	(193	)	$	285	$	(156	)
Selling, general, and administrative expense	1,817		356			2,070		(152		)
Net asset impairment and exit activity charges (recoveries)	$	2,136	$	163		$	2,355	$	(308	)

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	2,355			354
Cash payments	(1,329		)	(1,256		)
Balance at June 30	$	2,949		$	59

Income Taxes

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,487		$	6,294		$	8,058		$	9,101
Effective tax rate	24.6		%	21.6		%	23.5		%	22.6		%

Earnings per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	19,913	$	22,837	$	26,258	$	31,189
Denominator for basic earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Common stock options and stock units	321		691		330		674
Weighted average shares and conversions	32,642		32,553		32,630		32,498

Segment Information

6 Months Ended

Jun. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

SEGMENT INFORMATION

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


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


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


(iii)	Renewable Energy and Conservation, which primarily includes designing, engineering, manufacturing and installation of solar racking and electrical balance of 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 June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Net sales:
Residential Products	$	130,433		$	131,128		$	234,142		$	235,076
Industrial and Infrastructure Products	56,547			61,561			111,735			116,185
Less: Intersegment sales	(329		)	(368		)	(646		)	(589		)
Net Industrial and Infrastructure Products	56,218			61,193			111,089			115,596
Renewable Energy and Conservation	76,004			73,715			144,841			130,701
Total consolidated net sales	$	262,655		$	266,036		$	490,072		$	481,373

Income from operations:
Residential Products	$	20,778		$	24,196		$	32,868		$	37,434
Industrial and Infrastructure Products	4,069			6,604			8,198			9,206
Renewable Energy and Conservation	9,649			9,556			11,281			13,618
Unallocated Corporate Expenses	(7,890		)	(8,082		)	(15,175		)	(14,141		)
Total consolidated income from operations	$	26,606		$	32,274		$	37,172		$	46,117

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, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	129,566	$	46,315	$	8,469	$	184,350
Over Time	867		9,903		67,535		78,305
Total net sales	$	130,433	$	56,218	$	76,004	$	262,655



	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 net sales	$	131,128	$	61,193	$	73,715	$	266,036



	Six Months Ended June 30, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	232,458	$	91,602	$	15,759	$	339,819
Over Time	1,684		19,487		129,082		150,253
Total net sales	$	234,142	$	111,089	$	144,841	$	490,072



	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 net sales	$	235,076	$	115,596	$	130,701	$	481,373

Recent Accounting Pronouncements (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted



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

Recent Accounting Pronouncements Not Yet Adopted



Standard	Description	Financial Statement Effect or Other Significant Matters
ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326)	The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The provisions of this standard are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. An entity will apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective, that is, a modified-retrospective approach.	The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2020

Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2019

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following (in thousands):



	June 30, 2019			December 31, 2018
Trade accounts receivable	$	164,429		$	124,609
Costs in excess of billings	23,562			22,634
Total accounts receivables	187,991			147,243
Less allowance for doubtful accounts	(7,290		)	(6,960		)
Accounts receivable	$	180,701		$	140,283

Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability



	June 30, 2019			December 31, 2018
Costs in excess of billings	$	23,562		$	22,634
Billings in excess of cost	(38,133		)	(17,857		)
Unearned revenue	(9,971		)	(12,028		)



	Six Months Ended June 30, 2019		Six Months Ended June 30, 2018
Revenue recognized in the period from:
Amounts included in billings in excess of cost at the beginning of the period	$	11,357	$	9,044
Amounts included in unearned revenue at the beginning of the period	$	6,153	$	2,581

Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Schedule Of Inventories

Inventories consist of the following (in thousands):



	June 30, 2019		December 31, 2018
Raw material	$	49,162	$	57,845
Work-in-process	8,746		6,930
Finished goods	27,490		34,138
Total inventories	$	85,398	$	98,913

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Allocation Of Purchase Consideration To The Assets Acquired And Liabilities Assumed

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



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

Intangible Assets Acquired

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



	Fair Value		Estimated Useful Life
Trademarks	$	300	3 years
Technology	450		9 years
Customer relationships	700		9 years
Total	$	1,450

Goodwill and Related Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Changes In Carrying Amount Of Goodwill

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



	Residential Products		Industrial and Infrastructure Products		Renewable Energy & Conservation			Total
Balance at December 31, 2018	$	198,075	$	53,769	$	71,827		$	323,671
Adjustments to prior year acquisitions	—		—		(172		)	(172		)
Foreign currency translation	—		229		291			520
Balance at June 30, 2019	$	198,075	$	53,998	$	71,946		$	324,019

Schedule Of Acquired Intangible Assets

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



	June 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	43,870	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,134		3,820		6,094		3,518		3 to 15 Years
Unpatented technology	28,644		14,823		28,644		13,881		5 to 20 Years
Customer relationships	70,690		38,053		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,361		1,649		1,224		4 to 10 Years
	107,117		58,057		106,806		54,301
Total acquired intangible assets	$	150,987	$	58,057	$	150,676	$	54,301

Schedule of Acquired Intangible Asset Amortization Expense

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Amortization expense	$	1,797	$	2,148	$	3,594	$	4,287

Schedule Of Amortization Expense

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



	2019		2020		2021		2022		2023		2024
Amortization expense	$	3,593	$	6,894	$	6,700	$	6,221	$	5,683	$	5,428

Accumulated Other Comprehensive (Loss) Income (Tables)

6 Months Ended

Jun. 30, 2019

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

Schedule Of Components Of Accumulated Other Comprehensive Loss

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



	Foreign Currency Translation Adjustment			Minimum pension and post retirement benefit plan adjustments			Total Pre-Tax Amount			Tax (Benefit) Expense			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018	$	(5,939	)	$	(2,040	)	$	(7,979	)	$	(745	)	$	(7,234	)
Minimum pension and post retirement health care plan adjustments	—			16			16			4			12
Foreign currency translation adjustment	842			—			842			—			842
Balance at March 31, 2019	$	(5,097	)	$	(2,024	)	$	(7,121	)	$	(741	)	$	(6,380	)
Minimum pension and post retirement health care plan adjustments	—			17			17			5			12
Foreign currency translation adjustment	998			—			998			—			998
Balance at June 30, 2019	$	(4,099	)	$	(2,007	)	$	(6,106	)	$	(736	)	$	(5,370	)



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

Equity-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

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



	2019			2018
Awards	Number of Awards (1)	Weighted Average Grant Date Fair Value		Number of Awards (2)	Weighted Average Grant Date Fair Value
Performance stock units	145,420	$	40.55	132,288	$	33.35
Restricted stock units	117,821	$	39.37	69,055	$	33.41
Deferred stock units	7,509	$	37.95	10,255	$	35.96
Common shares	7,509	$	37.95	2,113	$	35.50

Management Stock Purchase Plan



	2019		2018
Restricted stock units credited	55,513		69,514
Share-based liabilities paid (in thousands)	$	5,742	$	4,717

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Assets And Liabilities, Lessee



(In thousands)	Classification	June 30, 2019
Assets	Operating lease assets	$	30,029

Liabilities
Current	Accrued expenses	$	8,958
Non-current	Non-current operating lease liabilities	21,375
		$	30,333

Lease, Cost



Lease cost (in thousands)	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	3,190	$	6,547



Other information (in thousands)	Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of operating liabilities	$	5,461
Right-of-use assets obtained in exchange for new lease liabilities	$	4,274



Lease Term and Discount Rate	June 30, 2019
Weighted-average remaining lease term - operating leases	4.22		years
Weighted-average discount rate - operating leases	5.76	%

Lessee, Operating Lease, Liability, Maturity



Maturity of lease liabilities	(In thousands)
2019 (July 1, 2019 through December 31, 2019)	$	5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933		)
Present value of lease liabilities	$	30,333

Exit Activity Costs and Asset Impairments (Tables)

6 Months Ended

Jun. 30, 2019

Restructuring and Related Activities [Abstract]

Summary Of Exit Activity Costs And Asset Impairments



	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Cost of sales	$	319	$	(193	)	$	285	$	(156	)
Selling, general, and administrative expense	1,817		356			2,070		(152		)
Net asset impairment and exit activity charges (recoveries)	$	2,136	$	163		$	2,355	$	(308	)



	Three months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment charges		Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	219		$	219		$	—	$	(29	)	$	(29	)
Industrial and Infrastructure Products	—		1,346			1,346			—		(28		)	(28		)
Renewable Energy and Conservation	—		(95		)	(95		)	65		(68		)	(3		)
Corporate	—		666			666			—		223			223
Total exit activity costs & asset impairments	$	—	$	2,136		$	2,136		$	65	$	98		$	163



	Six months ended June 30,
	2019								2018
	Inventory write-downs &/or asset impairment charges		Exit activity costs (recoveries), net			Total			Inventory write-downs &/or asset impairment (recoveries) charges, net			Exit activity (recoveries) costs, net			Total
Residential Products	$	—	$	370		$	370		$	(43	)	$	(152	)	$	(195	)
Industrial and Infrastructure Products	—		1,313			1,313			(703		)	190			(513		)
Renewable Energy and Conservation	—		(1		)	(1		)	84			49			133
Corporate	—		673			673			—			267			267
Total exit activity costs & asset impairments	$	—	$	2,355		$	2,355		$	(662	)	$	354		$	(308	)

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

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



	2019			2018
Balance at January 1	$	1,923		$	961
Exit activity costs recognized	2,355			354
Cash payments	(1,329		)	(1,256		)
Balance at June 30	$	2,949		$	59

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Summary Of Provision For Income Taxes For Continuing Operations

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Provision for income taxes	$	6,487		$	6,294		$	8,058		$	9,101
Effective tax rate	24.6		%	21.6		%	23.5		%	22.6		%

Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule Of Computation Of Basic And Diluted Loss Per Share

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Numerator:
Net income available to common shareholders	$	19,913	$	22,837	$	26,258	$	31,189
Denominator for basic earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Denominator for diluted earnings per share:
Weighted average shares outstanding	32,321		31,862		32,300		31,824
Common stock options and stock units	321		691		330		674
Weighted average shares and conversions	32,642		32,553		32,630		32,498

Segment Information (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Reconciliation Of Sales To Earnings Before Income Taxes by Segment

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Net sales:
Residential Products	$	130,433		$	131,128		$	234,142		$	235,076
Industrial and Infrastructure Products	56,547			61,561			111,735			116,185
Less: Intersegment sales	(329		)	(368		)	(646		)	(589		)
Net Industrial and Infrastructure Products	56,218			61,193			111,089			115,596
Renewable Energy and Conservation	76,004			73,715			144,841			130,701
Total consolidated net sales	$	262,655		$	266,036		$	490,072		$	481,373

Income from operations:
Residential Products	$	20,778		$	24,196		$	32,868		$	37,434
Industrial and Infrastructure Products	4,069			6,604			8,198			9,206
Renewable Energy and Conservation	9,649			9,556			11,281			13,618
Unallocated Corporate Expenses	(7,890		)	(8,082		)	(15,175		)	(14,141		)
Total consolidated income from operations	$	26,606		$	32,274		$	37,172		$	46,117

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, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	129,566	$	46,315	$	8,469	$	184,350
Over Time	867		9,903		67,535		78,305
Total net sales	$	130,433	$	56,218	$	76,004	$	262,655



	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 net sales	$	131,128	$	61,193	$	73,715	$	266,036



	Six Months Ended June 30, 2019
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	232,458	$	91,602	$	15,759	$	339,819
Over Time	1,684		19,487		129,082		150,253
Total net sales	$	234,142	$	111,089	$	144,841	$	490,072



	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 net sales	$	235,076	$	115,596	$	130,701	$	481,373

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 366,835		$ 338,995
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 1,600

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade accounts receivable	$ 164,429	$ 124,609
Costs in excess of billings	23,562	22,634
Total accounts receivables	187,991	147,243
Less allowance for doubtful accounts	(7,290)	(6,960)
Accounts receivable	$ 180,701	$ 140,283

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

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Costs in excess of billings	$ 23,562		$ 22,634
Amounts included in billings in excess of cost at the beginning of the period	11,357	$ 9,044
Amounts included in unearned revenue at the beginning of the period	6,153	$ 2,581
Billings in excess of cost
Capitalized Contract Cost [Line Items]
Contract with customer liability	(38,133)		(17,857)
Unearned revenue
Capitalized Contract Cost [Line Items]
Contract with customer liability	$ (9,971)		$ (12,028)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw material	$ 49,162	$ 57,845
Work-in-process	8,746	6,930
Finished goods	27,490	34,138
Total inventories	$ 85,398	$ 98,913

Acquisitions (Narrative) (Details) - USD ($)		3 Months Ended	6 Months Ended
Acquisitions (Narrative) (Details) - USD ($)	Aug. 21, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 324,019,000	$ 324,019,000		$ 323,671,000
SolarBOS
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 6,400,000
Goodwill	$ 2,879,000
Acquisition related costs		$ 4,000	$ 4,000	$ 0

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Aug. 21, 2018
Business Acquisition [Line Items]
Goodwill	$ 324,019	$ 323,671
SolarBOS
Business Acquisition [Line Items]
Cash			$ 915
Working capital			680
Property, plant and equipment			483
Acquired intangible assets			1,450
Other assets			13
Other liabilities			(51)
Goodwill			2,879
Fair value of purchase consideration			$ 6,369

Acquisitions (Schedule of Acquired Intangible Assets) (Details) - SolarBOS $ in Thousands	Aug. 21, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 1,450
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 300
Estimated Useful Life	3 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 450
Estimated Useful Life	9 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 700
Estimated Useful Life	9 years

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2018	$ 323,671
Adjustments to prior year acquisitions	(172)
Foreign currency translation	520
Balance at June 30, 2019	324,019
Residential Products
Goodwill [Roll Forward]
Balance at December 31, 2018	198,075
Adjustments to prior year acquisitions	0
Foreign currency translation	0
Balance at June 30, 2019	198,075
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at December 31, 2018	53,769
Adjustments to prior year acquisitions	0
Foreign currency translation	229
Balance at June 30, 2019	53,998
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at December 31, 2018	71,827
Adjustments to prior year acquisitions	(172)
Foreign currency translation	291
Balance at June 30, 2019	$ 71,946

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 107,117	$ 106,806
Total acquired intangible assets, Gross Carrying Amount	150,987	150,676
Accumulated Amortization, Finite-lived intangible assets	58,057	54,301
Total acquired intangible assets, Accumulated Amortization	58,057	54,301
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	6,134	6,094
Accumulated Amortization, Finite-lived intangible assets	3,820	3,518
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	28,644	28,644
Accumulated Amortization, Finite-lived intangible assets	14,823	13,881
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	70,690	70,419
Accumulated Amortization, Finite-lived intangible assets	38,053	35,678
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,649	1,649
Accumulated Amortization, Finite-lived intangible assets	1,361	1,224
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	43,870	43,870
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0
Minimum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	3 years
Minimum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	5 years
Minimum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	4 years
Maximum \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated Life	15 years
Maximum \| Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Estimated Life	20 years
Maximum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Life	17 years
Maximum \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Life	10 years

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,797	$ 2,148	$ 3,594	$ 4,287
2019	3,593		3,593
2020	6,894		6,894
2021	6,700		6,700
2022	6,221		6,221
2023	5,683		5,683
2024	$ 5,428		$ 5,428

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

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (7,121)	$ (7,979)	$ (5,539)	$ (5,336)	$ (7,979)	$ (5,336)
Accumulated other comprehensive income, tax, beginning balance	(741)	(745)	(960)	(970)	(745)	(970)
Accumulated Other Comprehensive Income Beginning Balance	(6,380)	(7,234)	(4,579)	(4,366)	(7,234)	(4,366)
Cumulative effect of new accounting principle in period of adoption							$ 1,582	$ 274
Other comprehensive income (loss), net of tax	1,010		(1,761)		1,864	(1,974)
AOCI before tax, ending balance	(6,106)	(7,121)	(7,289)	(5,539)	(6,106)	(7,289)
Accumulated other comprehensive income, tax, ending balance	(736)	(741)	(949)	(960)	(736)	(949)
Accumulated Other Comprehensive Income Ending Balance	(5,370)	(6,380)	(6,340)	(4,579)	(5,370)	(6,340)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(5,097)	(5,939)	(2,588)	(2,698)	(5,939)	(2,698)
Other comprehensive income adjustments	998	842	(1,787)	110
Other comprehensive income (loss), net of tax	998	842	(1,787)	110
AOCI before tax, ending balance	(4,099)	(5,097)	(4,375)	(2,588)	(4,099)	(4,375)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	17	16	37	37
Other comprehensive income (loss), tax	5	4	11	10
Other comprehensive income (loss), net of tax	12	12	26	27
Minimum pension and post retirement benefit plan adjustments \| Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,024)	(2,040)	(2,951)	(2,638)	(2,040)	(2,638)
Other comprehensive income adjustments	17	16	37	37
AOCI before tax, ending balance	$ (2,007)	$ (2,024)	$ (2,914)	$ (2,951)	$ (2,007)	$ (2,914)
Accounting Standards Update 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption								$ (350)

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

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	1 Months Ended		6 Months Ended
	Feb. 29, 2020	Feb. 28, 2017	Jun. 30, 2019	Jun. 30, 2018
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			145,420	132,288
Weighted average grant date fair value (in USD per share)			$ 40.55	$ 33.35
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			117,821	69,055
Weighted average grant date fair value (in USD per share)			$ 39.37	$ 33.41
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			7,509	10,255
Weighted average grant date fair value (in USD per share)			$ 37.95	$ 35.96
Common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)			7,509	2,113
Weighted average grant date fair value (in USD per share)			$ 37.95	$ 35.50
2015 Incentive Plan \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion as percentage of total award		95.50%
2015 Incentive Plan \| Scenario, Forecast \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued on conversion (in shares)	126,337

Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 26.1	$ 38.4
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target performance stock units earned	200.00%
Units converted (in shares)	256,000
Closing period	90 days
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation		$ 21.5	$ 23.6
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs compensation expense	$ 8.9

Equity-Based Compensation (Management Stock Purchase Plan) (Details) - Management Stock Purchase Plan - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based liabilities paid (in thousands)	$ 5,742,000	$ 4,717,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units credited (in shares)	$ 55,513	$ 69,514

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

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

Leases - Assets and Liabilities of Lessee (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease assets	$ 30,029
Accrued expenses	8,958
Non-current operating lease liabilities	21,375
Total operating lease liability	$ 30,333

Leases - Schedule of Lease Cost and Assumptions (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 3,190	$ 6,547
Cash paid for amounts included in the measurement of operating liabilities		5,461
Right-of-use assets obtained in exchange for new lease liabilities		$ 4,274
Weighted-average remaining lease term - operating leases	4 years 2 months 19 days	4 years 2 months 19 days
Weighted-average discount rate - operating leases	5.76%	5.76%

Leases - Maturity of Lease Payments (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
2019 (July 1, 2019 through December 31, 2019)	$ 5,517
2020	9,141
2021	7,168
2022	5,311
2023	4,670
After 2023	2,459
Total lease payments	34,266
Less: present value discount	(3,933)
Present value of lease liabilities	$ 30,333

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

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	$ 0	$ 65	$ 0	$ (662)
Exit activity costs (recoveries), net	2,136	98	2,355	354
Total exit activity costs & asset impairments	2,136	163	2,355	(308)
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	(43)
Exit activity costs (recoveries), net	219	(29)	370	(152)
Total exit activity costs & asset impairments	219	(29)	370	(195)
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	(703)
Exit activity costs (recoveries), net	1,346	(28)	1,313	190
Total exit activity costs & asset impairments	1,346	(28)	1,313	(513)
Renewable Energy and Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	65	0	84
Exit activity costs (recoveries), net	(95)	(68)	(1)	49
Total exit activity costs & asset impairments	(95)	(3)	(1)	133
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0	0
Exit activity costs (recoveries), net	666	223	673	267
Total exit activity costs & asset impairments	$ 666	$ 223	$ 673	$ 267

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 2,136	$ 163	$ 2,355	$ (308)
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	319	(193)	285	(156)
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,817	$ 356	$ 2,070	$ (152)

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance			$ 1,923	$ 961
Exit activity costs (recoveries), net	$ 2,136	$ 98	2,355	354
Cash payments			(1,329)	(1,256)
Ending balance	$ 2,949	$ 59	$ 2,949	$ 59

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 6,487	$ 6,294	$ 8,058	$ 9,101
Effective tax rate	24.60%	21.60%	23.50%	22.60%

Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
Earnings per Share (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 19,913	$ 6,345	$ 22,837	$ 8,352	$ 26,258	$ 31,189
Weighted average basic shares outstanding (in shares)	32,321,000		31,862,000		32,300,000	31,824,000
Common stock options and restricted stock (in shares)	321,000		691,000		330,000	674,000
Weighted average shares outstanding, diluted (in shares)	32,642,000		32,553,000		32,630,000	32,498,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	366,000		377,000		312,000	368,000

- Definition

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

+ References + Details

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments \| segment			3
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Income from operations:	63,558	70,503	107,458	118,821
Unallocated Corporate Expenses	(7,890)	(8,082)	(15,175)	(14,141)
Total consolidated income from operations	26,606	32,274	37,172	46,117
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	130,433	131,128	234,142	235,076
Income from operations:	20,778	24,196	32,868	37,434
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	56,218	61,193	111,089	115,596
Income from operations:	4,069	6,604	8,198	9,206
Renewable Energy & Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	76,004	73,715	144,841	130,701
Income from operations:	9,649	9,556	11,281	13,618
Operating Segments \| Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	130,433	131,128
Operating Segments \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	56,547	61,561
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ (329)	$ (368)	(646)	(589)
Intersegment Elimination \| Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:			$ 111,735	$ 116,185

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales:	$ 262,655	$ 266,036	$ 490,072	$ 481,373
Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	130,433	131,128	234,142	235,076
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	56,218	61,193	111,089	115,596
Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	76,004	73,715	144,841	130,701
Point in Time
Disaggregation of Revenue [Line Items]
Net sales:	184,350	191,110	339,819	346,157
Point in Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	129,566	130,958	232,458	233,842
Point in Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	46,315	51,428	91,602	97,971
Point in Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	8,469	8,724	15,759	14,344
Over Time
Disaggregation of Revenue [Line Items]
Net sales:	78,305	74,926	150,253	135,216
Over Time \| Residential Products
Disaggregation of Revenue [Line Items]
Net sales:	867	170	1,684	1,234
Over Time \| Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net sales:	9,903	9,765	19,487	17,625
Over Time \| Renewable Energy & Conservation
Disaggregation of Revenue [Line Items]
Net sales:	$ 67,535	$ 64,991	$ 129,082	$ 116,357

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (350,000)
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,582,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 624,000