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Inventories (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished product $ 165,710 $ 156,542
Work in process 93,859 87,284
Raw Material 34,078 39,859
Supplies and other 48,467 47,130
Inventories $ 342,114 $ 330,815