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Inventory (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 223,149 $ 190,140
Work-in-progress 20,468 18,889
Raw materials 77,875 82,940
Manufacturing and maintenance supplies 10,566 10,117
Total inventory $ 332,058 $ 302,086