Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 210,677	$ 219,424
Finite-Lived Intangible Assets, Accumulated Amortization	(104,673)	(95,158)
Amortization expense	17,945	19,230	14,792
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	16,200
Finite-Lived Intangible Assets, Amortization Expense, Year Two	14,300
Finite-Lived Intangible Assets, Amortization Expense, Year Three	13,400
Finite-Lived Intangible Assets, Amortization Expense, Year Four	12,700
Finite-Lived Intangible Assets, Amortization Expense, Year Five	12,500
Unpatented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	35,933	43,133
Finite-Lived Intangible Assets, Accumulated Amortization	(6,979)	(11,776)
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	7,809	7,904
Finite-Lived Intangible Assets, Accumulated Amortization	(6,213)	(5,397)
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	8,981	9,244
Finite-Lived Intangible Assets, Accumulated Amortization	(6,206)	(4,525)
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	421	0
Finite-Lived Intangible Assets, Accumulated Amortization	(88)	0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	157,533	159,143
Finite-Lived Intangible Assets, Accumulated Amortization	$ (85,187)	$ (73,460)