Goodwill and Identified Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 255,275	$ 251,044
Accumulated Amortization	(74,793)	(68,771)
Net Carrying Amount	$ 180,482	182,273
License Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	5 years
Gross Carrying Amount	$ 3,902	3,908
Accumulated Amortization	(3,203)	(3,131)
Net Carrying Amount	$ 699	777
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives
Gross Carrying Amount	$ 4,720	4,731
Accumulated Amortization	(4,720)	(4,731)
Net Carrying Amount	$ 0	0
Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	12 years
Gross Carrying Amount	$ 2,067	2,067
Accumulated Amortization	(692)	(623)
Net Carrying Amount	$ 1,375	1,444
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	15 years
Gross Carrying Amount	$ 22,509	21,722
Accumulated Amortization	(5,728)	(5,199)
Net Carrying Amount	$ 16,781	16,523
Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	3 years
Gross Carrying Amount	$ 1,210	1,140
Accumulated Amortization	(890)	(839)
Net Carrying Amount	$ 320	301
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	13 years
Gross Carrying Amount	$ 165,288	163,386
Accumulated Amortization	(37,015)	(32,196)
Net Carrying Amount	$ 128,273	131,190
Patents and acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Lives	15 years
Gross Carrying Amount	$ 55,579	54,090
Accumulated Amortization	(22,545)	(22,052)
Net Carrying Amount	$ 33,034	$ 32,038