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Inventories (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished product $ 180,476 $ 156,542
Work in process 95,750 87,284
Raw Material 32,998 39,859
Supplies and other 50,411 47,130
Inventories $ 359,635 $ 330,815