Goodwill and Identified Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 221,645	$ 221,662
Accumulated Amortization	(92,824)	(89,317)
Net Carrying Amount	$ 128,821	132,345
License agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	10 years 9 months 28 days
Gross Carrying Amount	$ 4,511	4,497
Accumulated Amortization	(3,667)	(3,623)
Net Carrying Amount	$ 844	874
Leases
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	2 years 9 months
Gross Carrying Amount	$ 796	796
Accumulated Amortization	(556)	(534)
Net Carrying Amount	$ 240	262
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	10 years 2 months 5 days
Gross Carrying Amount	$ 15,494	15,464
Accumulated Amortization	(6,508)	(6,184)
Net Carrying Amount	$ 8,986	9,280
Non-competes
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	1 year 11 months 18 days
Gross Carrying Amount	$ 1,201	1,197
Accumulated Amortization	(1,075)	(1,048)
Net Carrying Amount	$ 126	149
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	9 years 8 months
Gross Carrying Amount	$ 160,543	160,423
Accumulated Amortization	(59,638)	(56,907)
Net Carrying Amount	$ 100,905	103,516
Patents and acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives (Years)	5 years 11 months 13 days
Gross Carrying Amount	$ 39,100	39,285
Accumulated Amortization	(21,380)	(21,021)
Net Carrying Amount	$ 17,720	$ 18,264