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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Inventory, Net [Abstract] |  |  |  |
Raw materials | $ 68,091 |  | $ 40,725 |
Work-in-process | 22,286 |  | 15,259 |
Finished goods | 12,834 |  | 9,753 |
Operating and other supplies | 128,294 |  | 94,188 |
Inventories (1) | $ 231,505 | [1] | $ 159,925 | [1]
[1] | The balance at September 30, 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.

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