Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 125,361	$ 108,527
Total acquired intangible assets, Gross Carrying Amount	176,656	154,297
Accumulated Amortization, Finite-lived intangible assets	66,175	61,705
Total acquired intangible assets, Accumulated Amortization	66,175	61,705
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	6,753	6,139
Accumulated Amortization, Finite-lived intangible assets	4,328	4,105
Unpatented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	35,383	29,544
Accumulated Amortization, Finite-lived intangible assets	17,031	15,807
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	80,976	71,195
Accumulated Amortization, Finite-lived intangible assets	42,876	40,294
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,949	1,649
Accumulated Amortization, Finite-lived intangible assets	1,640	1,499
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	300	0
Accumulated Amortization, Finite-lived intangible assets	300	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	51,295	45,770
Accumulated Amortization, Indefinite-lived intangible assets	$ 0	$ 0