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Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Government grants $ 145 $ 0  
Government Grants $ 8,703   $ 8,599
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 50 years    
Other Current Liabilities [Member]      
Finite-Lived Intangible Assets [Line Items]      
Government Grants $ 463   446
Other Noncurrent Liabilities [Member]      
Finite-Lived Intangible Assets [Line Items]      
Government Grants $ 8,240   $ 8,153