Gibraltar Industries (ROCK) 10-Q 6 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	May 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
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		32,408,882
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000912562
Current Fiscal Year End Date	--12-31

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net Sales	$ 249,439	$ 227,417
Cost of sales	193,052	183,517
Gross profit	56,387	43,900
Selling, general, and administrative expense	41,197	33,334
Income from operations	15,190	10,566
Interest (income) expense	(47)	2,061
Other expense	192	589
Income before taxes	15,045	7,916
Provision for income taxes	2,986	1,571
Net income	$ 12,059	$ 6,345
Net earnings per share:
Basic (in USD per share)	$ 0.37	$ 0.20
Diluted (in USD per share)	$ 0.37	$ 0.19
Weighted average shares outstanding:
Basic (in shares)	32,586	32,279
Diluted (in shares)	32,883	32,617

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 12,059	$ 6,345
Other comprehensive (loss) income:
Foreign currency translation adjustment	(5,898)	842
Minimum pension and post retirement benefit plan adjustments	18	12
Other comprehensive (loss) income	(5,880)	854
Total comprehensive income	$ 6,179	$ 7,199

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 85,966	$ 191,363
Accounts receivable, net of allowance of $5,781 and $6,330	172,452	147,515
Inventories	88,585	78,476
Prepaid expenses and other current assets	16,149	19,748
Total current assets	363,152	437,102
Property, plant, and equipment, net	95,882	95,409
Operating lease assets	33,991	27,662
Goodwill	382,045	329,705
Acquired intangibles	107,528	92,592
Other assets	1,924	1,980
Total assets	984,522	984,450
Current liabilities:
Accounts payable	102,816	83,136
Accrued expenses	84,140	98,463
Billings in excess of cost	34,567	47,598
Total current liabilities	221,523	229,197
Deferred income taxes	39,999	40,334
Non-current operating lease liabilities	24,968	19,669
Other non-current liabilities	20,675	21,286
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; 33,388 shares and 33,192 shares issued and outstanding in 2020 and 2019	334	332
Additional paid-in capital	297,269	295,582
Retained earnings	417,436	405,668
Accumulated other comprehensive loss	(11,271)	(5,391)
Cost of 986 and 906 common shares held in treasury in 2020 and 2019	(26,411)	(22,227)
Total shareholders’ equity	677,357	673,964
Total liabilities and shareholders' equity	$ 984,522	$ 984,450

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 5,781	$ 6,330
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)	33,388,000	33,192,000
Treasury stock, shares (in shares)	986,000	906,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities
Net income	$ 12,059	$ 6,345
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	5,338	4,941
Stock compensation expense	1,665	2,371
(Benefit of) provision for deferred income taxes	(216)	393
Other, net	411	2,456
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(7,059)	(27,623)
Inventories	(6,004)	35
Other current assets and other assets	6,144	165
Accounts payable	(17,789)	5,332
Accrued expenses and other non-current liabilities	(37,561)	(31,903)
Net cash used in operating activities	(43,012)	(37,488)
Cash Flows from Investing Activities
Acquisitions, net of cash acquired	(54,539)	(264)
Net proceeds from sale of property and equipment	52	22
Purchases of property, plant, and equipment	(2,822)	(3,132)
Net cash used in investing activities	(57,309)	(3,374)
Cash Flows from Financing Activities
Long-term debt payments	0	(210,000)
Payment of debt issuance costs	0	(1,235)
Purchase of treasury stock at market prices	(4,184)	(2,151)
Net proceeds from issuance of common stock	24	139
Net cash used in financing activities	(4,160)	(213,247)
Effect of exchange rate changes on cash	(916)	612
Net decrease in cash and cash equivalents	(105,397)	(253,497)
Cash and cash equivalents at beginning of year	191,363	297,006
Cash and cash equivalents at end of period	$ 85,966	$ 43,509

Consolidated Statement of Share

Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance, shares at Dec. 31, 2018		32,887				796
Balance, value at Dec. 31, 2018	$ 596,693	$ 329	$ 282,525	$ 338,995	$ (7,234)	$ (17,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,345			6,345
Foreign currency translation adjustment	842				842
Minimum pension and post retirement benefit plan adjustments, net of taxes of $7	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, 2019		33,192				906
Balance, value at Dec. 31, 2019	673,964	$ 332	295,582	405,668	(5,391)	$ (22,227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,059			12,059
Foreign currency translation adjustment	(5,898)				(5,898)
Minimum pension and post retirement benefit plan adjustments, net of taxes of $7	18				18
Stock compensation expense	1,665		1,665
Stock options exercised, shares		3
Stock options exercised	24		24
Net settlement of restricted stock units, shares		193				80
Net settlement of restricted stock units	(4,184)	$ 2	(2)			$ (4,184)
Balance, shares at Mar. 31, 2020		33,388				986
Balance, value at Mar. 31, 2020	$ 677,357	$ 334	$ 297,269	$ 417,436	$ (11,271)	$ (26,411)

Consolidated Statement of Sha_2

Consolidated Statement of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Adjustment to pension benefit liability, taxes	$ 7	$ 4

Consolidated Financial Statemen

Consolidated Financial Statements	3 Months Ended
	Mar. 31, 2020
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, such as the impact of the COVID-19 pandemic, 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, 2019 . The balance sheet at December 31, 2019 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

Recent Accounting Pronouncement

Recent Accounting Pronouncements (Notes)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS Recent Accounting Pronouncements Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326) The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the modified retrospective approach through a cumulative-effect adjustment to retained earnings of $291,000, net of $96,000 of income taxes, on the opening consolidated balance sheet as of January 1, 2020. The Company's financial assets that are in the scope of the standard are contract assets and accounts receivables which are short-term in nature. Additionally, the Company has identified and implemented appropriate changes to the Company's business processes, policies and internal controls to support reporting and disclosures. Date of adoption: Q1 2020 ASU 2018-15 Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract The amendments in this update require an entity to apply the same requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract as the entity would for implementation costs incurred to develop or obtain internal-use software. The accounting for the service element is not affected by the amendments in this update. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the prospective method of adoption, and the adoption did not have a material impact to the Company's financial statements. Date of adoption: Q1 2020 Recent Accounting Pronouncements Not Yet Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued, with the amendments to be applied on a respective, modified retrospective or prospective basis, depending on the specific amendment. The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2021

Accounts Receivable and Allowan

Accounts Receivable and Allowance for Doubtful Accounts	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS	ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS Accounts receivable consists of the following (in thousands): March 31, 2020 December 31, 2019 Trade accounts receivable $ 156,399 $ 133,238 Costs in excess of billings 21,834 20,607 Total accounts receivables 178,233 153,845 Less allowance for doubtful accounts and contract assets (5,781 ) (6,330 ) Accounts receivable $ 172,452 $ 147,515 Refer to Note 4 "Revenue" concerning the Company's costs in excess of billings. The Company is exposed to credit losses through sales of products and services. The Company’s expected loss allowance methodology for accounts receivable and costs in excess of billings (collectively "accounts receivable") is developed using historical collection experience, current and future economic and market conditions, and a review of the current status of customers' accounts receivables. Due to the short-term nature of such accounts receivable, the estimated amount of accounts receivable that may not be collected is based on aging of the accounts receivable balances. Additionally, specific allowance amounts are established to record the appropriate provision for customers that no longer share risk characteristics similar with other accounts receivable. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of customers' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible. The Company considered the current and expected future economic and market conditions surrounding the coronavirus ("COVID-19") pandemic and determined that the estimate of credit losses was not significantly impacted as of March 31, 2020. Estimates are used to determine the allowance. It is based on assessment of anticipated payment and all other historical, current and future information that is reasonably available. The following table provides a roll-forward of the allowance for credit losses that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected. Beginning balance as of January 1, 2020 $ 6,330 Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings 387 Bad debt expense 69 Write-off charged against the allowance and other adjustments (1,005 ) Ending balance as of March 31, 2020 $ 5,781

Revenue Revenue

Revenue Revenue	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Sales includes revenue from contracts with customers for designing, engineering, manufacturing and installation of solar racking systems and greenhouse structures; extraction systems; roof and foundation ventilation products; centralized mail systems and electronic package solutions; rain dispersion products and roofing accessories; expanded and perforated metal; perimeter security solutions; expansion joints and structural bearings. Refer to Note 14 "Segment Information" for additional information related to revenue recognized by timing of transfer of control by reportable segment. As of March 31, 2020 , the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less. Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue. The following table presents the beginning and ending balances of costs in excess of billings, billings in excess of cost and unearned revenue as of March 31, 2020 and December 31, 2019, respectively, and revenue recognized during the three months ended March 31, 2020 and 2019, respectively, that was in billings in excess of cost and unearned revenue at the beginning of the period (in thousands): March 31, 2020 December 31, 2019 Costs in excess of billings $ 21,834 $ 20,607 Billings in excess of cost (34,567 ) (47,598 ) Unearned revenue (19,388 ) (17,311 ) Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Revenue recognized in the period from: Amounts included in billings in excess of cost at the beginning of the period $ 29,221 $ 9,697 Amounts included in unearned revenue at the beginning of the period $ 9,619 $ 4,661

Inventories

Inventories	3 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories consist of the following (in thousands): March 31, 2020 December 31, 2019 Raw material $ 50,601 $ 45,700 Work-in-process 9,471 5,988 Finished goods 28,513 26,788 Total inventories $ 88,585 $ 78,476

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS On February 13, 2020, the Company purchased substantially all of the assets of Delta Separations, LLC, a California limited liability company, and Teaching Tech, LLC, a California limited liability company (collectively described as "Delta Separations"). Delta Separations was a privately-held engineering company primarily engaged in the assembly and sale of centrifugal ethanol-based extraction systems. The results of Delta Separations have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The preliminary purchase consideration for the acquisition of Delta Separations was $47.2 million , which includes a working capital adjustment and certain other adjustments provided for in the asset purchase agreement expected to be remitted in the next three to six months, at which time a final purchase price will be determined. The purchase price for the acquisition of the assets was preliminarily allocated to the assets acquired and liabilities assumed based upon their respective fair values. The excess consideration was recorded as goodwill and approximated $39.3 million , all of which is deductible for tax purposes. Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and presence in the extraction processing markets. The preliminary 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): Working capital $ 3,183 Property, plant and equipment 337 Acquired intangible assets 7,600 Other assets 923 Other liabilities (4,189 ) Goodwill 39,335 Fair value of purchase consideration $ 47,189 The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 2,000 5 years Technology 2,200 10 years Customer relationships 3,400 5 years Total $ 7,600 On January 15, 2020, the Company purchased substantially all of the assets of Thermo Energy Systems, Inc., a Canadian-based, privately held provider of commercial greenhouse solutions in North America supporting the plant based organic food market. The results of Thermo Energy Systems have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The preliminary purchase consideration for the acquisition of Thermo Energy Systems was $7.3 million . The purchase price for the acquisition was preliminarily allocated to the assets acquired and liabilities assumed based upon their respective estimated fair values and the remaining consideration was recorded to goodwill. Goodwill of approximately $13.3 million was recorded, 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 commercial greenhouse markets. The preliminary allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands): Cash $ 58 Working capital (16,464 ) Property, plant and equipment 1,029 Acquired intangible assets 9,386 Other assets 1,285 Other liabilities (1,285 ) Goodwill 13,324 Fair value of purchase consideration $ 7,333 The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 635 3 years Technology 2,541 15 years Customer relationships 6,210 10 years Total $ 9,386 On August 30, 2019, the Company acquired all of the outstanding membership interests of Apeks LLC ("Apeks"), a designer and manufacturer of botanical oil extraction systems and equipment. The results of Apeks have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewable Energy and Conservation segment. The aggregate purchase consideration for the acquisition of Apeks was $12.6 million , which includes a working capital adjustment and certain other adjustments provided for in the stock purchase agreement. The purchase price for the acquisition was preliminarily allocated to the assets acquired and liabilities assumed based upon their respective fair values. The excess consideration was recorded as goodwill and approximated $5.9 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 presence in the extraction processing markets. The preliminary allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands): Cash $ 4,154 Working capital (1,412 ) Property, plant and equipment 1,059 Acquired intangible assets 3,400 Other assets 508 Other liabilities (1,081 ) Goodwill 5,933 Fair value of purchase consideration $ 12,561 The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 1,900 5 years Technology 900 7 years Customer relationships 600 6 years Total $ 3,400 In determining the allocation of the purchase price to the assets acquired and the liabilities assumed, the Company uses all available information to make fair value determinations using Level 3 unobservable inputs in which little or no market data exists, and therefore, engages independent valuation specialists to assist in the fair value determination of the acquired long-lived assets. The acquisitions of Delta Separations, Thermo Energy Systems and Apeks were funded from available cash on hand. The Company incurred certain acquisition-related costs composed of legal and consulting fees. These costs were recognized as a component of selling, general, and administrative expenses in the consolidated statement of operations. During the three months ended March 31, 2020 , the Company incurred $1.3 million of acquisition-related costs. The Company did no t incur any acquisition-related costs during the three months ended March 31, 2019 .

Goodwill and Related Intangible

Goodwill and Related Intangible Assets	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND RELATED INTANGIBLE ASSETS	GOODWILL AND RELATED INTANGIBLE ASSETS Goodwill The changes in the carrying amount of goodwill for the three months ended March 31, 2020 are as follows (in thousands): Renewable Energy & Conservation Residential Products Industrial and Infrastructure Products Total Balance at December 31, 2019 $ 77,602 $ 198,075 $ 54,028 $ 329,705 Acquired goodwill 52,659 — — 52,659 Adjustments to prior year acquisitions 75 — — 75 Foreign currency translation 75 — (469 ) (394 ) Balance at March 31, 2020 $ 130,411 $ 198,075 $ 53,559 $ 382,045 The Company conducts its annual goodwill impairment test as of October 31 each year. All of the Company’s ten reporting units had fair values exceeding their carrying values as of October 31, 2019. In addition to the annual impairment test, the Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. The Company considered the current and future macroeconomic and market conditions, along with its current market capitalization, projected cash flows and internal and external forecasts, and projections relating to the impact of the COVID-19 pandemic on each of its reporting units. The Company determined that a triggering event has not occurred which would require an interim impairment test to be performed. Acquired Intangible Assets Acquired intangible assets consist of the following (in thousands): March 31, 2020 December 31, 2019 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Weighted-Average Amortization Period Indefinite-lived intangible assets: Trademarks $ 45,770 $ — $ 45,770 $ — Indefinite Finite-lived intangible assets: Trademarks 8,693 4,239 6,139 4,105 3 to 15 Years Unpatented technology 34,289 16,354 29,544 15,807 5 to 20 Years Customer relationships 80,777 41,490 71,195 40,294 5 to 17 Years Non-compete agreements 1,649 1,567 1,649 1,499 4 to 10 Years 125,408 63,650 108,527 61,705 Total acquired intangible assets $ 171,178 $ 63,650 $ 154,297 $ 61,705 The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands): Three Months Ended 2020 2019 Amortization expense $ 2,078 $ 1,797 Amortization expense related to acquired intangible assets for the remainder of fiscal 2020 and the next five years thereafter is estimated as follows (in thousands): 2020 2021 2022 2023 2024 2025 Amortization expense $ 5,311 $ 6,937 $ 6,459 $ 5,921 $ 5,666 $ 5,566

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2020
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT The Company did no t have any long-term debt outstanding at March 31, 2020 and December 31, 2019 . Senior Credit Agreement On January 24, 2019, the Company entered into a Sixth Amended and Restated Credit Agreement ("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 March 31, 2020, the Company is in compliance with all three covenants. Borrowings under the Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and general intangibles of the Company’s significant domestic subsidiaries. Standby letters of credit of $5.9 million have been issued under the Senior Credit Agreement on behalf of the Company as of March 31, 2020 . These letters of credit reduce the amount otherwise available under the revolving credit facility. As of March 31, 2020 , the Company had $394.1 million of availability under the revolving credit facility. No borrowings were outstanding under the Company's revolving credit facility at March 31, 2020 and December 31, 2019 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	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 months ended March 31, (in thousands): Foreign Currency Translation Adjustment Minimum pension and post retirement benefit plan Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other Balance at December 31, 2019 $ (4,173 ) $ (1,939 ) $ (6,112 ) $ (721 ) $ (5,391 ) Minimum pension and post retirement health care plan adjustments — 25 25 7 18 Foreign currency translation adjustment (5,898 ) — (5,898 ) — (5,898 ) Balance at March 31, 2020 $ (10,071 ) $ (1,914 ) $ (11,985 ) $ (714 ) $ (11,271 ) Foreign Currency Translation Adjustment Minimum pension and post retirement benefit plan Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other 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 )

Equity-Based Compensation

Equity-Based Compensation	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]
EQUITY-BASED COMPENSATION	EQUITY-BASED COMPENSATION On May 4, 2018, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Plan"). The 2018 Plan provides for the issuance of up to 1,000,000 shares of common stock and supplements the remaining shares available for issuance under the existing Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "2015 Plan"). Both the 2018 Plan and the 2015 Plan allow the Company to grant equity-based incentive compensation awards, in the form of non-qualified options, restricted shares, restricted stock units, performance shares, performance stock units, and stock rights to eligible participants. In 2016, the shareholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2016 Stock Plan for Non-Employee Directors ("Non-Employee Directors Plan") which allows the Company to grant awards of shares of the Company's common stock to non-employee Directors of the Company and permits the Directors to defer receipt of such shares pursuant to the terms of the Non-Employee Directors Plan. Equity Based Awards - Settled in Stock The following table sets forth the number of equity-based awards granted during the three months ended March 31, which will convert to shares upon vesting, along with the weighted average grant date fair values: 2020 2019 Awards Number of Awards (1) Weighted Average Grant Date Fair Value Number of Awards (2) Weighted Average Grant Date Fair Value Performance stock units 123,870 $ 53.29 145,420 $ 40.55 Restricted stock units 42,101 $ 52.31 117,821 $ 39.37 (1) The Company’s performance stock units (“PSUs”) represent shares granted for which the final number of shares earned depends on financial performance or market conditions. The number of shares to be issued may vary between 0% and 200% of the number of performance stock units granted depending on the relative achievement to targeted thresholds. The Company's PSUs with a financial performance condition are based on either the Company’s return on invested capital (“ROIC”) over a one-year period performance period or revenue, gross profit and operating profit thresholds over a two or three-year performance period. The Company's PSUs with a market condition are based on the ranking of the Company’s total shareholder return (“TSR”) performance, on a percentile basis, over a three year performance period compared to the S&P Small Cap Industrial sector, over the same three year performance period. (2) Performance stock units granted in 2019 have converted to 168,688 shares to be issued to recipients in the first quarter of 2022, representing 116% of the targeted 2019 award, based on the Company’s actual ROIC compared to ROIC target for the performance period ended December 31, 2019. Equity Based Awards - Settled in Cash The Company's equity-based liability includes awards under a management stock purchase plan. As of March 31, 2020 , the Company's total share-based liabilities recorded on the consolidated balance sheet were $28.7 million , of which $12.2 million was included in non-current liabilities. The share-based liabilities as of December 31, 2019 were $28.0 million , of which $13.2 million was included in non-current liabilities. 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 three months ended March 31, : 2020 2019 Restricted stock units credited 52,411 51,608 Share-based liabilities paid (in thousands) $ 4,433 $ 4,933

Exit Activity Costs and Asset I

Exit Activity Costs and Asset Impairments	3 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS	EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS The Company has incurred exit activity costs and asset impairment charges as a result of its 80/20 simplification and portfolio management initiatives. These initiatives have resulted in the identification of low-volume, low margin, internally-produced products which have been or will be outsourced or discontinued, the simplification of processes, in the sale and exiting of less profitable businesses or products lines, and the reduction in our manufacturing footprint. Exit activity costs were incurred during the three months ended March 31, 2020 and 2019 which related to moving and closing costs, contract terminations, and severance incurred as a result of process simplification initiatives. No facilities were closed as a result of these initiatives during these respective periods. The following tables set forth the exit activity costs (recoveries) incurred by segment during the three months ended March 31, related to the restructuring activities described above (in thousands): Three months ended March 31, 2020 2019 Renewable Energy and Conservation $ 18 $ 94 Residential Products 221 151 Industrial and Infrastructure Products (2 ) (33 ) Corporate 54 7 Total exit activity costs $ 291 $ 219 The following table provides a summary of where the exit activity costs (recoveries) were recorded in the consolidated statements of income for the three months ended March 31, (in thousands): Three Months Ended 2020 2019 Cost of sales $ 87 $ (34 ) Selling, general, and administrative expense 204 253 Net exit activity charges $ 291 $ 219 The following table reconciles the beginning and ending liability for exit activity costs relating to the Company’s facility consolidation efforts (in thousands): 2020 2019 Balance at January 1 $ 5,449 $ 1,923 Exit activity costs recognized 291 219 Cash payments (4,728 ) (550 ) Balance at March 31 $ 1,012 $ 1,592

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three months ended March 31, and the applicable effective tax rates: Three Months Ended 2020 2019 Provision for income taxes $ 2,986 $ 1,571 Effective tax rate 19.8 % 19.8 % The effective tax rate for the three months ended March 31, 2020 and 2019, respectively, was less than the U.S. federal statutory rate of 21% due to favorable discrete items partially offset by state taxes and nondeductible permanent differences.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings and diluted weighted-average shares outstanding are as follows for the three months ended March 31, (in thousands): Three Months Ended 2020 2019 Numerator: Net income available to common shareholders $ 12,059 $ 6,345 Denominator for basic earnings per share: Weighted average shares outstanding 32,586 32,279 Denominator for diluted earnings per share: Weighted average shares outstanding 32,586 32,279 Common stock options and stock units 297 338 Weighted average shares and conversions 32,883 32,617 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 18,000 and 258,000 for the three months ended March 31, 2020 and 2019 , respectively.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2020
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION The Company is organized into three reportable segments on the basis of the production process and products and services provided by each segment, identified as follows: (i) Renewable Energy and Conservation, which primarily includes designing, engineering, manufacturing and installation of solar racking, electrical balance of systems, extraction systems and greenhouse structures; (ii) Residential Products, which primarily includes roof and foundation ventilation products, rain dispersion products and roofing accessories, centralized mail systems and electronic package solutions; and (iii) Industrial and Infrastructure Products, which primarily includes expanded and perforated metal, perimeter security systems, expansion joints, and structural bearings. When determining the reportable segments, the Company aggregated operating segments based on their similar economic and operating characteristics. The following table illustrates certain measurements used by management to assess performance of the segments described above for the three months ended March 31, (in thousands): Three Months Ended 2020 2019 Net sales: Renewable Energy and Conservation $ 96,497 $ 68,837 Residential Products 103,419 103,709 Industrial and Infrastructure Products 49,801 55,188 Less: Intersegment sales (278 ) (317 ) Net Industrial and Infrastructure Products 49,523 54,871 Total consolidated net sales $ 249,439 $ 227,417 Income from operations: Renewable Energy and Conservation $ 5,699 $ 1,632 Residential Products 13,725 12,090 Industrial and Infrastructure Products 3,989 4,129 Unallocated Corporate Expenses (8,223 ) (7,285 ) Total consolidated income from operations $ 15,190 $ 10,566 The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three months ended March 31 (in thousands): Three Months Ended March 31, 2020 Renewable Energy and Conservation Residential Products Industrial and Infrastructure Products Total Net sales: Point in Time $ 14,588 $ 102,331 $ 39,495 $ 156,414 Over Time 81,909 1,088 10,028 93,025 Total net sales $ 96,497 $ 103,419 $ 49,523 $ 249,439 Three Months Ended March 31, 2019 Renewable Energy and Conservation Residential Products Industrial and Infrastructure Products Total Net sales: Point in Time $ 7,290 $ 102,892 $ 45,287 $ 155,469 Over Time 61,547 817 9,584 71,948 Total net sales $ 68,837 $ 103,709 $ 54,871 $ 227,417

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326) The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the modified retrospective approach through a cumulative-effect adjustment to retained earnings of $291,000, net of $96,000 of income taxes, on the opening consolidated balance sheet as of January 1, 2020. The Company's financial assets that are in the scope of the standard are contract assets and accounts receivables which are short-term in nature. Additionally, the Company has identified and implemented appropriate changes to the Company's business processes, policies and internal controls to support reporting and disclosures. Date of adoption: Q1 2020 ASU 2018-15 Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract The amendments in this update require an entity to apply the same requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract as the entity would for implementation costs incurred to develop or obtain internal-use software. The accounting for the service element is not affected by the amendments in this update. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the prospective method of adoption, and the adoption did not have a material impact to the Company's financial statements. Date of adoption: Q1 2020 Recent Accounting Pronouncements Not Yet Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued, with the amendments to be applied on a respective, modified retrospective or prospective basis, depending on the specific amendment. The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2021

Recent Accounting Pronounceme_3

Recent Accounting Pronouncements - (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Recent Accounting Pronouncements Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2016-13 Financial Instruments - Credit Losses (Topic 326) The objective of this standard is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit, including trade receivables, held by an entity at each reporting date. The amendments in this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the modified retrospective approach through a cumulative-effect adjustment to retained earnings of $291,000, net of $96,000 of income taxes, on the opening consolidated balance sheet as of January 1, 2020. The Company's financial assets that are in the scope of the standard are contract assets and accounts receivables which are short-term in nature. Additionally, the Company has identified and implemented appropriate changes to the Company's business processes, policies and internal controls to support reporting and disclosures. Date of adoption: Q1 2020 ASU 2018-15 Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract The amendments in this update require an entity to apply the same requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract as the entity would for implementation costs incurred to develop or obtain internal-use software. The accounting for the service element is not affected by the amendments in this update. The standard is effective for the Company as of January 1, 2020. The Company adopted the amendments in this update using the prospective method of adoption, and the adoption did not have a material impact to the Company's financial statements. Date of adoption: Q1 2020 Recent Accounting Pronouncements Not Yet Adopted Standard Description Financial Statement Effect or Other Significant Matters ASU No. 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued, with the amendments to be applied on a respective, modified retrospective or prospective basis, depending on the specific amendment. The Company is currently evaluating the requirements of this standard. The standard is not expected to have a material impact on the Company's financial statements. Date of adoption: Q1 2021

Accounts Receivable and Allow_2

Accounts Receivable and Allowance for Doubtful Accounts (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable consists of the following (in thousands): March 31, 2020 December 31, 2019 Trade accounts receivable $ 156,399 $ 133,238 Costs in excess of billings 21,834 20,607 Total accounts receivables 178,233 153,845 Less allowance for doubtful accounts and contract assets (5,781 ) (6,330 ) Accounts receivable $ 172,452 $ 147,515 The following table provides a roll-forward of the allowance for credit losses that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected. Beginning balance as of January 1, 2020 $ 6,330 Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings 387 Bad debt expense 69 Write-off charged against the allowance and other adjustments (1,005 ) Ending balance as of March 31, 2020 $ 5,781

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	The following table presents the beginning and ending balances of costs in excess of billings, billings in excess of cost and unearned revenue as of March 31, 2020 and December 31, 2019, respectively, and revenue recognized during the three months ended March 31, 2020 and 2019, respectively, that was in billings in excess of cost and unearned revenue at the beginning of the period (in thousands): March 31, 2020 December 31, 2019 Costs in excess of billings $ 21,834 $ 20,607 Billings in excess of cost (34,567 ) (47,598 ) Unearned revenue (19,388 ) (17,311 ) Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Revenue recognized in the period from: Amounts included in billings in excess of cost at the beginning of the period $ 29,221 $ 9,697 Amounts included in unearned revenue at the beginning of the period $ 9,619 $ 4,661

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Schedule Of Inventories	Inventories consist of the following (in thousands): March 31, 2020 December 31, 2019 Raw material $ 50,601 $ 45,700 Work-in-process 9,471 5,988 Finished goods 28,513 26,788 Total inventories $ 88,585 $ 78,476

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Combinations [Abstract]
Allocation Of Purchase Consideration To The Assets Acquired And Liabilities Assumed	The preliminary 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): Working capital $ 3,183 Property, plant and equipment 337 Acquired intangible assets 7,600 Other assets 923 Other liabilities (4,189 ) Goodwill 39,335 Fair value of purchase consideration $ 47,189 The preliminary allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands): Cash $ 58 Working capital (16,464 ) Property, plant and equipment 1,029 Acquired intangible assets 9,386 Other assets 1,285 Other liabilities (1,285 ) Goodwill 13,324 Fair value of purchase consideration $ 7,333	The preliminary allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands): Cash $ 4,154 Working capital (1,412 ) Property, plant and equipment 1,059 Acquired intangible assets 3,400 Other assets 508 Other liabilities (1,081 ) Goodwill 5,933 Fair value of purchase consideration $ 12,561
Intangible Assets Acquired	The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 2,000 5 years Technology 2,200 10 years Customer relationships 3,400 5 years Total $ 7,600 The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 635 3 years Technology 2,541 15 years Customer relationships 6,210 10 years Total $ 9,386	The intangible assets acquired in this acquisition consisted of the following (in thousands): Fair Value Weighted-Average Amortization Period Trademarks $ 1,900 5 years Technology 900 7 years Customer relationships 600 6 years Total $ 3,400

Goodwill and Related Intangib_2

Goodwill and Related Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Changes In Carrying Amount Of Goodwill	The changes in the carrying amount of goodwill for the three months ended March 31, 2020 are as follows (in thousands): Renewable Energy & Conservation Residential Products Industrial and Infrastructure Products Total Balance at December 31, 2019 $ 77,602 $ 198,075 $ 54,028 $ 329,705 Acquired goodwill 52,659 — — 52,659 Adjustments to prior year acquisitions 75 — — 75 Foreign currency translation 75 — (469 ) (394 ) Balance at March 31, 2020 $ 130,411 $ 198,075 $ 53,559 $ 382,045
Schedule Of Acquired Intangible Assets	Acquired intangible assets consist of the following (in thousands): March 31, 2020 December 31, 2019 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Weighted-Average Amortization Period Indefinite-lived intangible assets: Trademarks $ 45,770 $ — $ 45,770 $ — Indefinite Finite-lived intangible assets: Trademarks 8,693 4,239 6,139 4,105 3 to 15 Years Unpatented technology 34,289 16,354 29,544 15,807 5 to 20 Years Customer relationships 80,777 41,490 71,195 40,294 5 to 17 Years Non-compete agreements 1,649 1,567 1,649 1,499 4 to 10 Years 125,408 63,650 108,527 61,705 Total acquired intangible assets $ 171,178 $ 63,650 $ 154,297 $ 61,705
Schedule of Acquired Intangible Asset Amortization Expense	The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands): Three Months Ended 2020 2019 Amortization expense $ 2,078 $ 1,797
Schedule Of Amortization Expense	Amortization expense related to acquired intangible assets for the remainder of fiscal 2020 and the next five years thereafter is estimated as follows (in thousands): 2020 2021 2022 2023 2024 2025 Amortization expense $ 5,311 $ 6,937 $ 6,459 $ 5,921 $ 5,666 $ 5,566

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2020
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 months ended March 31, (in thousands): Foreign Currency Translation Adjustment Minimum pension and post retirement benefit plan Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other Balance at December 31, 2019 $ (4,173 ) $ (1,939 ) $ (6,112 ) $ (721 ) $ (5,391 ) Minimum pension and post retirement health care plan adjustments — 25 25 7 18 Foreign currency translation adjustment (5,898 ) — (5,898 ) — (5,898 ) Balance at March 31, 2020 $ (10,071 ) $ (1,914 ) $ (11,985 ) $ (714 ) $ (11,271 ) Foreign Currency Translation Adjustment Minimum pension and post retirement benefit plan Total Pre-Tax Amount Tax (Benefit) Expense Accumulated Other 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 )

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule Of Number Of Awards And Weighted Average Grant Date Fair Value	The following table sets forth the number of equity-based awards granted during the three months ended March 31, which will convert to shares upon vesting, along with the weighted average grant date fair values: 2020 2019 Awards Number of Awards (1) Weighted Average Grant Date Fair Value Number of Awards (2) Weighted Average Grant Date Fair Value Performance stock units 123,870 $ 53.29 145,420 $ 40.55 Restricted stock units 42,101 $ 52.31 117,821 $ 39.37 (1) The Company’s performance stock units (“PSUs”) represent shares granted for which the final number of shares earned depends on financial performance or market conditions. The number of shares to be issued may vary between 0% and 200% of the number of performance stock units granted depending on the relative achievement to targeted thresholds. The Company's PSUs with a financial performance condition are based on either the Company’s return on invested capital (“ROIC”) over a one-year period performance period or revenue, gross profit and operating profit thresholds over a two or three-year performance period. The Company's PSUs with a market condition are based on the ranking of the Company’s total shareholder return (“TSR”) performance, on a percentile basis, over a three year performance period compared to the S&P Small Cap Industrial sector, over the same three year performance period. (2) Performance stock units granted in 2019 have converted to 168,688 shares to be issued to recipients in the first quarter of 2022, representing 116% of the targeted 2019 award, based on the Company’s actual ROIC compared to ROIC target for the performance period ended December 31, 2019.
Management Stock Purchase Plan	The following table provides the number of restricted stock units credited to active participant accounts and the payments made with respect to restricted stock units issued under the MSPP during the three months ended March 31, : 2020 2019 Restricted stock units credited 52,411 51,608 Share-based liabilities paid (in thousands) $ 4,433 $ 4,933

Exit Activity Costs and Asset_2

Exit Activity Costs and Asset Impairments (Tables)	3 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Summary Of Exit Activity Costs And Asset Impairments	The following tables set forth the exit activity costs (recoveries) incurred by segment during the three months ended March 31, related to the restructuring activities described above (in thousands): Three months ended March 31, 2020 2019 Renewable Energy and Conservation $ 18 $ 94 Residential Products 221 151 Industrial and Infrastructure Products (2 ) (33 ) Corporate 54 7 Total exit activity costs $ 291 $ 219 The following table provides a summary of where the exit activity costs (recoveries) were recorded in the consolidated statements of income for the three months ended March 31, (in thousands): Three Months Ended 2020 2019 Cost of sales $ 87 $ (34 ) Selling, general, and administrative expense 204 253 Net exit activity charges $ 291 $ 219
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): 2020 2019 Balance at January 1 $ 5,449 $ 1,923 Exit activity costs recognized 291 219 Cash payments (4,728 ) (550 ) Balance at March 31 $ 1,012 $ 1,592

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Summary Of Provision For Income Taxes For Continuing Operations	The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three months ended March 31, and the applicable effective tax rates: Three Months Ended 2020 2019 Provision for income taxes $ 2,986 $ 1,571 Effective tax rate 19.8 % 19.8 %

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2020
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 months ended March 31, (in thousands): Three Months Ended 2020 2019 Numerator: Net income available to common shareholders $ 12,059 $ 6,345 Denominator for basic earnings per share: Weighted average shares outstanding 32,586 32,279 Denominator for diluted earnings per share: Weighted average shares outstanding 32,586 32,279 Common stock options and stock units 297 338 Weighted average shares and conversions 32,883 32,617

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2020
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Reconciliation Of Sales To Earnings Before Income Taxes by Segment	The following table illustrates certain measurements used by management to assess performance of the segments described above for the three months ended March 31, (in thousands): Three Months Ended 2020 2019 Net sales: Renewable Energy and Conservation $ 96,497 $ 68,837 Residential Products 103,419 103,709 Industrial and Infrastructure Products 49,801 55,188 Less: Intersegment sales (278 ) (317 ) Net Industrial and Infrastructure Products 49,523 54,871 Total consolidated net sales $ 249,439 $ 227,417 Income from operations: Renewable Energy and Conservation $ 5,699 $ 1,632 Residential Products 13,725 12,090 Industrial and Infrastructure Products 3,989 4,129 Unallocated Corporate Expenses (8,223 ) (7,285 ) Total consolidated income from operations $ 15,190 $ 10,566
Disaggregation of Revenue	The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three months ended March 31 (in thousands): Three Months Ended March 31, 2020 Renewable Energy and Conservation Residential Products Industrial and Infrastructure Products Total Net sales: Point in Time $ 14,588 $ 102,331 $ 39,495 $ 156,414 Over Time 81,909 1,088 10,028 93,025 Total net sales $ 96,497 $ 103,419 $ 49,523 $ 249,439 Three Months Ended March 31, 2019 Renewable Energy and Conservation Residential Products Industrial and Infrastructure Products Total Net sales: Point in Time $ 7,290 $ 102,892 $ 45,287 $ 155,469 Over Time 61,547 817 9,584 71,948 Total net sales $ 68,837 $ 103,709 $ 54,871 $ 227,417

Recent Accounting Pronounceme_4

Recent Accounting Pronouncements - Narrative (Details) - USD ($)	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ (291,000)			$ 1,582,000
Income tax benefit		$ (2,986,000)	$ (1,571,000)
Accounting Standards Update 2016-13
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Income tax benefit	96,000
Retained Earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of new accounting principle in period of adoption	(291,000)			$ 1,582,000
Retained Earnings | Accounting Standards Update 2016-13
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ (291,000)

Accounts Receivable and Allow_3

Accounts Receivable and Allowance for Doubtful Accounts - Schedule of Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Trade accounts receivable	$ 156,399	$ 133,238
Costs in excess of billings	21,834	20,607
Total accounts receivables	178,233	153,845
Less allowance for doubtful accounts and contract assets	(5,781)	(6,330)
Accounts receivable	$ 172,452	$ 147,515

Accounts Receivable and Allow_4

Accounts Receivable and Allowance for Doubtful Accounts - Schedule of Accounts Receivable Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance as of January 1, 2020	$ 6,330
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings	5,781
Bad debt expense	69
Write-off charged against the allowance and other adjustments	(1,005)
Ending balance as of March 31, 2020	$ 5,781
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings		$ 387

Revenue - Narrative (Details)

Revenue - Narrative (Details)	Mar. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation expected timing of satisfaction	1 year

Revenue - Contract Assets and L

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Costs in excess of billings	$ 21,834		$ 20,607
Amounts included in billings in excess of cost at the beginning of the period	29,221	$ 9,697
Amounts included in unearned revenue at the beginning of the period	9,619	$ 4,661
Billings in excess of cost
Capitalized Contract Cost [Line Items]
Contract with customer liability	(34,567)		(47,598)
Unearned revenue
Capitalized Contract Cost [Line Items]
Contract with customer liability	$ (19,388)		$ (17,311)

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw material	$ 50,601	$ 45,700
Work-in-process	9,471	5,988
Finished goods	28,513	26,788
Total inventories	$ 88,585	$ 78,476

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Feb. 13, 2020	Jan. 15, 2020	Aug. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill				$ 382,045		$ 329,705
Delta Separations
Business Acquisition [Line Items]
Aggregate consideration for acquisition	$ 47,200
Goodwill	$ 39,335
Thermo Energy Systems
Business Acquisition [Line Items]
Aggregate consideration for acquisition		$ 7,300
Goodwill		$ 13,324
Apeks
Business Acquisition [Line Items]
Aggregate consideration for acquisition			$ 12,600
Goodwill			$ 5,933
Selling, general and administrative costs
Business Acquisition [Line Items]
Acquisition related costs				$ 1,300	$ 0

Acquisitions (Allocation of Pur

Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Feb. 13, 2020	Jan. 15, 2020	Dec. 31, 2019	Aug. 30, 2019
Business Acquisition [Line Items]
Goodwill	$ 382,045			$ 329,705
Delta Separations
Business Acquisition [Line Items]
Working capital		$ 3,183
Property, plant and equipment		337
Acquired intangible assets		7,600
Other assets		923
Other liabilities		(4,189)
Goodwill		39,335
Fair value of purchase consideration		$ 47,189
Thermo Energy Systems
Business Acquisition [Line Items]
Cash			$ 58
Working capital			(16,464)
Property, plant and equipment			1,029
Acquired intangible assets			9,386
Other assets			1,285
Other liabilities			(1,285)
Goodwill			13,324
Fair value of purchase consideration			$ 7,333
Apeks
Business Acquisition [Line Items]
Cash					$ 4,154
Working capital					(1,412)
Property, plant and equipment					1,059
Acquired intangible assets					3,400
Other assets					508
Other liabilities					(1,081)
Goodwill					5,933
Fair value of purchase consideration					$ 12,561

Acquisitions (Schedule of Acqui

Acquisitions (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Feb. 13, 2020	Jan. 15, 2020	Aug. 30, 2019
Delta Separations
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 7,600
Delta Separations | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 2,000
Estimated Useful Life	5 years
Delta Separations | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 2,200
Estimated Useful Life	10 years
Delta Separations | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,400
Estimated Useful Life	5 years
Thermo Energy Systems
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 9,386
Thermo Energy Systems | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 635
Estimated Useful Life		3 years
Thermo Energy Systems | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 2,541
Estimated Useful Life		15 years
Thermo Energy Systems | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 6,210
Estimated Useful Life		10 years
Apeks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 3,400
Apeks | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 1,900
Estimated Useful Life			5 years
Apeks | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 900
Estimated Useful Life			7 years
Apeks | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 600
Estimated Useful Life			6 years

Goodwill and Related Intangib_3

Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2019	$ 329,705
Acquired goodwill	52,659
Adjustments to prior year acquisitions	75
Foreign currency translation	(394)
Balance at March 31, 2020	382,045
Renewable Energy and Conservation
Goodwill [Roll Forward]
Balance at December 31, 2019	77,602
Acquired goodwill	52,659
Adjustments to prior year acquisitions	75
Foreign currency translation	75
Balance at March 31, 2020	130,411
Residential Products
Goodwill [Roll Forward]
Balance at December 31, 2019	198,075
Acquired goodwill	0
Adjustments to prior year acquisitions	0
Foreign currency translation	0
Balance at March 31, 2020	198,075
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at December 31, 2019	54,028
Acquired goodwill	0
Adjustments to prior year acquisitions	0
Foreign currency translation	(469)
Balance at March 31, 2020	$ 53,559

Goodwill and Related Intangib_4

Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 125,408	$ 108,527
Total acquired intangible assets, Gross Carrying Amount	171,178	154,297
Accumulated Amortization, Finite-lived intangible assets	63,650	61,705
Total acquired intangible assets, Accumulated Amortization	63,650	61,705
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	8,693	6,139
Accumulated Amortization, Finite-lived intangible assets	4,239	4,105
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	34,289	29,544
Accumulated Amortization, Finite-lived intangible assets	16,354	15,807
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	80,777	71,195
Accumulated Amortization, Finite-lived intangible assets	41,490	40,294
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	1,567	1,499
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	45,770	45,770
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 Intangib_5

Goodwill and Related Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,078	$ 1,797
2020	5,311
2021	6,937
2022	6,459
2023	5,921
2024	5,666
2025	$ 5,566

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020USD ($)covenant	Dec. 31, 2019USD ($)	Jan. 24, 2019USD ($)
Debt Instrument [Line Items]
Carrying value of outstanding debt	$ 0	$ 0
Revolving Credit Facility | Senior Credit Agreement
Debt Instrument [Line Items]
Revolving credit facility, availability amount	394,100,000
Borrowings outstanding	0	$ 0
Standby Letters of Credit | Senior Credit Agreement
Debt Instrument [Line Items]
Letters of credit issued	$ 5,900,000
Line of Credit | 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Current borrowing capacity			$ 400,000,000
Letters of credit issued			700,000,000
Number of debt covenants | covenant	3
Medium-term Notes | 2019 Senior Credit Agreement
Debt Instrument [Line Items]
Debt instrument, issued value			$ 300,000,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (6,112)	$ (7,979)
Accumulated other comprehensive income, tax, beginning balance	(721)	(745)
Accumulated Other Comprehensive Income Beginning Balance	(5,391)	(7,234)
Other comprehensive income (loss), net of tax	(5,880)	854
AOCI before tax, ending balance	(11,985)	(7,121)
Accumulated other comprehensive income, tax, ending balance	(714)	(741)
Accumulated Other Comprehensive Income Ending Balance	(11,271)	(6,380)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(4,173)	(5,939)
Other comprehensive income adjustments	(5,898)	842
Other comprehensive income (loss), net of tax	(5,898)	842
AOCI before tax, ending balance	(10,071)	(5,097)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	25	16
Other comprehensive income (loss), tax	7	4
Other comprehensive income (loss), net of tax	18	12
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	(1,939)	(2,040)
Other comprehensive income adjustments	25	16
AOCI before tax, ending balance	$ (1,914)	$ (2,024)

Equity-Based Compensation - Inc

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

Equity-Based Compensation (Sche

Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2020	Mar. 31, 2019
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)		123,870	145,420
Weighted average grant date fair value (in USD per share)		$ 53.29	$ 40.55
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards (in shares)		42,101	117,821
Weighted average grant date fair value (in USD per share)		$ 52.31	$ 39.37
2018 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		116.00%
2018 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)	168,688
Minimum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants based on targeted thresholds, percent		0.00%
Maximum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants based on targeted thresholds, percent		200.00%
Return on Invested Capital | 2018 Plan | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		1 year
Gross Profit Threshold | Minimum | 2018 Plan | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		2 years
Gross Profit Threshold | Maximum | 2018 Plan | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Total Shareholder Return | 2018 Plan | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years

Equity-Based Compensation (Equi

Equity-Based Compensation (Equity Based Awards - Settled in Cash) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	$ 28,700,000		$ 28,000,000
Non Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued equity based compensation	12,200,000		$ 13,200,000
Management Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based liabilities paid (in thousands)	$ 4,433,000	$ 4,933,000
Management Stock Purchase Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average company stock price measurement period	200 days
Restricted stock units credited (in shares)	$ 52,411	$ 51,608

Exit Activity Costs and Asset_3

Exit Activity Costs and Asset Impairments (Narrative) (Details) - facility	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Number of facilities closed	0	0

Exit Activity Costs and Asset_4

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total exit activity costs	$ 291	$ 219
Renewable Energy and Conservation
Restructuring Cost and Reserve [Line Items]
Total exit activity costs	18	94
Residential Products
Restructuring Cost and Reserve [Line Items]
Total exit activity costs	221	151
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Total exit activity costs	(2)	(33)
Corporate
Restructuring Cost and Reserve [Line Items]
Total exit activity costs	$ 54	$ 7

Exit Activity Costs and Asset_5

Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 291	$ 219
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	87	(34)
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 204	$ 253

Exit Activity Costs and Asset_6

Exit Activity Costs and Asset Impairments (Reconciles of Liability for Exit Activity Costs Relating to Facility Consolidation Efforts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning balance	$ 5,449	$ 1,923
Exit activity costs (recoveries), net	291	219
Cash payments	(4,728)	(550)
Ending balance	$ 1,012	$ 1,592

Income Taxes (Provision For Inc

Income Taxes (Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 2,986	$ 1,571
Effective tax rate	19.80%	19.80%

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 12,059	$ 6,345
Weighted average basic shares outstanding (in shares)	32,586,000	32,279,000
Common stock options and restricted stock (in shares)	297,000	338,000
Weighted average shares outstanding, diluted (in shares)	32,883,000	32,617,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	18,000	258,000

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)segment	Mar. 31, 2019USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments | segment	3
Net Sales	$ 249,439	$ 227,417
Total consolidated income from operations	15,190	10,566
Renewable Energy and Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	96,497	68,837
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	103,419	103,709
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	49,523	54,871
Operating Segments | Renewable Energy and Conservation
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	96,497	68,837
Total consolidated income from operations	5,699	1,632
Operating Segments | Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	103,419	103,709
Total consolidated income from operations	13,725	12,090
Operating Segments | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	49,801	55,188
Total consolidated income from operations	3,989	4,129
Intersegment Elimination
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net Sales	(278)	(317)
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Unallocated Corporate Expenses	$ (8,223)	$ (7,285)

Segment Information - Disaggreg

Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 249,439	$ 227,417
Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	96,497	68,837
Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	103,419	103,709
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	49,523	54,871
Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	156,414	155,469
Point in Time | Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	14,588	7,290
Point in Time | Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	102,331	102,892
Point in Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	39,495	45,287
Over Time
Disaggregation of Revenue [Line Items]
Net Sales	93,025	71,948
Over Time | Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	81,909	61,547
Over Time | Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	1,088	817
Over Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	$ 10,028	$ 9,584

Uncategorized Items - rock-2020

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0