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Business Combinations - Acquisition (Details) - USD ($)
$ in Thousands
9 Months Ended
May 15, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Mar. 11, 2016
Business Acquisition          
Goodwill   $ 68,933   $ 61,744  
Net cash paid   $ 19,121 $ 73,063    
Noliac A/S          
Business Acquisition          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 9,142        
Current assets 2,836        
Property, plant and equipment 980        
Other assets 108        
Goodwill 7,189        
Less fair value of liabilities acquired (1,134)        
Net cash paid 19,121        
CTG Advanced Materials, LLC          
Business Acquisition          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         $ 35,427
Current assets         4,215
Property, plant and equipment         6,173
Other assets         37
Goodwill         27,879
Fair value of assets acquired $ 20,255       73,731
Less fair value of liabilities acquired         $ (668)