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Acquisition (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Apr. 03, 2017
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill acquired   $ 685,990 $ 685,990 $ 633,436
Gammaflux L.P. [Member]        
Business Acquisition [Line Items]        
Purchase price $ 8,866      
Cash acquired 2      
Goodwill acquired 1,535      
Intangible assets acquired $ 3,700      
Acquisition-related costs     $ 184  
Net sales   $ 6,483