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Business Combinations - Acquisition (Details) - USD ($)
$ in Thousands
Mar. 11, 2016
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition      
Goodwill   $ 61,744 $ 61,744
CTG Advanced      
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 73,731    
Less fair value of liabilities acquired (668)    
Net cash paid $ 73,063