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Goodwill and Intangible Assets Government Grants (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Government grants during period   $ 407 $ 1,055  
Government Grants $ 8,859 $ 8,859   $ 8,599
Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Asset, Useful Life   1 year    
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 481 $ 481   446
Other Noncurrent Liabilities [Member]        
Finite-Lived Intangible Assets [Line Items]        
Government Grants $ 8,378 $ 8,378   $ 8,153
Government grants [Member] | Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Asset, Useful Life 10 years      
Government grants [Member] | Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Asset, Useful Life 50 years