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Business Combinations - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 15, 2017
Mar. 11, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition            
Cost of goods sold     $ 69,892 $ 64,236 $ 135,822 $ 127,472
Noliac A/S            
Business Acquisition            
Net cash paid $ 19,265          
Cash acquired in acquisition $ 55          
CTG Advanced Materials, LLC            
Business Acquisition            
Net cash paid   $ 73,063        
Cash acquired in acquisition   $ 4        
Acquisition related cost         $ 804