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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Raw materials $ 65,947 $ 52,121
Work-in-process 32,679 34,025
Finished goods 20,052 15,988
Operating and other supplies 114,610 129,738
Total inventories $ 233,288 $ 231,872