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Inventories (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Inventory Items, Net Of Reserves Alternative [Abstract]    
Raw materials $ 91,981 $ 95,430
Work in progress 17,598 16,585
Finished goods 170,397 150,667
Total inventories $ 279,976 $ 262,682