Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 154,981	$ 155,183
Total acquired intangible assets, Gross Carrying Amount	211,651	211,753
Accumulated Amortization, Finite-lived intangible assets	59,774	55,388
Total acquired intangible assets, Accumulated Amortization	59,774	55,388
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	5,831	5,818
Accumulated Amortization, Finite-lived intangible assets	3,574	3,385
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	38,892	38,752
Accumulated Amortization, Finite-lived intangible assets	18,479	17,765
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	98,135	98,500
Accumulated Amortization, Finite-lived intangible assets	33,298	31,580
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	4,888	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	7,235	7,228
Accumulated Amortization, Finite-lived intangible assets	2,510	911
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	56,670	56,570
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0