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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Raw materials $ 69,776 $ 40,725
Work-in-process 22,183 15,259
Finished goods 17,661 9,753
Operating and other supplies 129,995 94,188
Inventories (1) $ 239,615 [1] $ 159,925 [1]
[1] The balance at December 31, 2013 includes inventory maintained at the recently acquired Sebree smelter. See Note 2 Acquisition of Sebree aluminum smelter for additional information about the Sebree acquisition.