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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Inventory Disclosure [Abstract]    
Finished product $ 156,542 $ 164,428
Work in process 87,284 84,474
Inventory, Raw Materials, Net of Reserves 39,859 48,401
Supplies and other 47,130 47,280
Inventories $ 330,815 $ 344,583