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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Raw materials $ 52,121 $ 76,655
Work-in-process 34,025 43,248
Finished goods 15,988 19,969
Operating and other supplies 129,738 143,608
Inventories $ 231,872 $ 283,480