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Business Combinations - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 11, 2016
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition      
Cost of goods sold   $ 65,930 $ 63,237
CTG Advanced      
Business Acquisition      
Net cash paid $ 73,063    
Cash acquired in acquisition $ 4    
Acquisition related cost   $ 804