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Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill acquired   $ 674,785 $ 633,436
Gammaflux L.P. [Member]      
Business Acquisition [Line Items]      
Purchase price $ 8,754    
Cash acquired 2    
Goodwill acquired 1,467    
Intangible assets acquired 3,700    
Acquisition-related costs $ 184    
Net sales   $ 3,282