Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 221,247	$ 221,095
Accumulated Amortization	(104,987)	(101,399)
Net Carrying Amount	$ 116,260	119,696
License agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	1 year 5 months 14 days
Gross Carrying Amount	$ 3,894	3,894
Accumulated Amortization	(3,751)	(3,716)
Net Carrying Amount	$ 143	178
Leases
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	1 year 9 months 1 day
Gross Carrying Amount	$ 864	864
Accumulated Amortization	(711)	(689)
Net Carrying Amount	$ 153	175
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	9 years 6 months 6 days
Gross Carrying Amount	$ 15,788	15,751
Accumulated Amortization	(6,416)	(6,202)
Net Carrying Amount	$ 9,372	9,549
Non-competes
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	4 years 1 month 5 days
Gross Carrying Amount	$ 2,527	2,529
Accumulated Amortization	(1,296)	(1,229)
Net Carrying Amount	$ 1,231	1,300
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	8 years 7 months 16 days
Gross Carrying Amount	$ 159,592	159,719
Accumulated Amortization	(69,329)	(66,753)
Net Carrying Amount	$ 90,263	92,966
Patents and acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	5 years 7 months 5 days
Gross Carrying Amount	$ 38,582	38,338
Accumulated Amortization	(23,484)	(22,810)
Net Carrying Amount	$ 15,098	$ 15,528