Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 244,050	$ 247,711
Indefinite-lived other intangible asset	4,687	4,845
Total other intangible assets, gross carrying amount	248,737	252,556
Accumulated Amortization	137,333	134,530
Net Carrying Amount	106,717	113,181
Total other intangible assets, net carrying amount	111,404	118,026
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	150,219	150,863
Accumulated Amortization	74,661	72,014
Net Carrying Amount	75,558	78,849
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,478	83,469
Accumulated Amortization	53,235	53,540
Net Carrying Amount	27,243	29,929
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,013	12,039
Accumulated Amortization	8,509	8,149
Net Carrying Amount	3,504	3,890
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	928	827
Net Carrying Amount	$ 412	$ 513