Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 242,761	$ 247,711
Indefinite-lived other intangible asset	4,578	4,845
Total other intangible assets, gross carrying amount	247,339	252,556
Accumulated Amortization	139,306	134,530
Net Carrying Amount	103,455	113,181
Total other intangible assets, net carrying amount	108,033	118,026
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	149,676	150,863
Accumulated Amortization	75,790	72,014
Net Carrying Amount	73,886	78,849
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	79,768	83,469
Accumulated Amortization	53,868	53,540
Net Carrying Amount	25,900	29,929
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,977	12,039
Accumulated Amortization	8,671	8,149
Net Carrying Amount	3,306	3,890
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	977	827
Net Carrying Amount	$ 363	$ 513