Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Government grants	$ 8,650	$ 0	$ 0
Finite-Lived Intangible Assets, Gross	178,059	210,677
Finite-Lived Intangible Assets, Accumulated Amortization	(107,046)	(104,673)
Amortization expense	17,333	17,945	$ 19,230
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	12,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	10,800
Finite-Lived Intangible Assets, Amortization Expense, Year Three	9,800
Finite-Lived Intangible Assets, Amortization Expense, Year Four	9,800
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 8,500
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	50 years
Unpatented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 8,530	35,933
Finite-Lived Intangible Assets, Accumulated Amortization	(2,660)	(6,979)
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	7,770	7,809
Finite-Lived Intangible Assets, Accumulated Amortization	(6,753)	(6,213)
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	10,052	8,981
Finite-Lived Intangible Assets, Accumulated Amortization	(6,886)	(6,206)
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0	421
Finite-Lived Intangible Assets, Accumulated Amortization	0	(88)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	138,223	154,945
Finite-Lived Intangible Assets, Accumulated Amortization	(90,180)	(84,776)
Use Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	13,484	2,588
Finite-Lived Intangible Assets, Accumulated Amortization	$ (567)	$ (411)