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Inventories (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Finished product $ 197,108 $ 176,184
Work in process 82,650 78,501
Raw Material 30,829 32,502
Supplies and other 37,722 53,841
Inventories $ 348,309 $ 341,028