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Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 162,784	$ 155,183
Total acquired intangible assets, Gross Carrying Amount	223,784	211,753
Accumulated Amortization, Finite-lived intangible assets	69,129	55,388
Total acquired intangible assets, Accumulated Amortization	69,129	55,388
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,520	5,818
Accumulated Amortization, Finite-lived intangible assets	3,878	3,385
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	38,442	38,752
Accumulated Amortization, Finite-lived intangible assets	19,891	17,765
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	108,937	98,500
Accumulated Amortization, Finite-lived intangible assets	37,815	31,580
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	2,685	4,885
Accumulated Amortization, Finite-lived intangible assets	1,913	1,747
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	7,200	7,228
Accumulated Amortization, Finite-lived intangible assets	5,632	911
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	61,000	56,570
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0

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Acquired Intangible Assets, Total.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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