Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 243,617	$ 247,711
Indefinite-lived other intangible asset	4,642	4,845
Total other intangible assets, gross carrying amount	248,259	252,556
Accumulated Amortization	133,886	134,530
Net Carrying Amount	109,731	113,181
Total other intangible assets, net carrying amount	114,373	118,026
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	150,060	150,863
Accumulated Amortization	73,022	72,014
Net Carrying Amount	77,039	78,849
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,208	83,469
Accumulated Amortization	51,671	53,540
Net Carrying Amount	28,536	29,929
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,009	12,039
Accumulated Amortization	8,316	8,149
Net Carrying Amount	3,693	3,890
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	877	827
Net Carrying Amount	$ 463	$ 513