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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished product $ 184,778 $ 156,542
Work in process 100,147 87,284
Raw Material 37,609 39,859
Supplies and other 52,564 47,130
Inventories $ 375,098 $ 330,815