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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Finished product $ 176,932 $ 171,277
Work in process 107,910 101,540
Raw Material 32,648 33,173
Supplies and other 55,631 52,193
Inventories $ 373,121 $ 358,183