Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 163,172	$ 155,183
Total acquired intangible assets, Gross Carrying Amount	224,272	211,753
Accumulated Amortization, Finite-lived intangible assets	64,538	55,388
Total acquired intangible assets, Accumulated Amortization	64,538	55,388
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,550	5,818
Accumulated Amortization, Finite-lived intangible assets	3,747	3,385
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	38,386	38,752
Accumulated Amortization, Finite-lived intangible assets	19,194	17,765
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	109,329	98,500
Accumulated Amortization, Finite-lived intangible assets	35,658	31,580
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	2,691	4,885
Accumulated Amortization, Finite-lived intangible assets	1,859	1,747
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	7,216	7,228
Accumulated Amortization, Finite-lived intangible assets	4,080	911
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	61,100	56,570
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0