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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Finished product $ 186,828 $ 171,277
Work in process 97,172 101,540
Raw Material 34,520 33,173
Supplies and other 52,035 52,193
Inventories $ 370,555 $ 358,183