Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 243,730	$ 244,647
Accumulated Amortization	75,930	72,164
Total other intangible assets, gross carrying amount	248,164	249,172
Net Carrying Amount	167,800	172,483
Indefinite-lived other intangible asset	4,434	4,525
Total other intangible assets, net carrying amount	172,234	177,008
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	149,404	149,753
Accumulated Amortization	32,196	30,078
Net Carrying Amount	117,208	119,675
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,979	81,535
Accumulated Amortization	39,925	38,624
Net Carrying Amount	41,054	42,911
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,007	12,019
Accumulated Amortization	3,496	3,213
Net Carrying Amount	8,511	8,806
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,340
Accumulated Amortization	313	249
Net Carrying Amount	$ 1,027	$ 1,091