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Business Combinations - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 11, 2016
Sep. 30, 2016
Sep. 27, 2015
Sep. 30, 2016
Sep. 27, 2015
Business Acquisition          
Cost of goods sold   $ 63,056 $ 59,200 $ 190,528 $ 192,073
CTG Advanced          
Business Acquisition          
Net cash paid $ 73,063        
Cash acquired in acquisition $ 4        
Acquisition related cost   0   804  
Cost of goods sold   $ 0   $ 1,151