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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials	$ 60,512		$ 40,725
Work-in-process	21,703		15,259
Finished goods	17,435		9,753
Operating and other supplies	125,057		94,188
Inventories	$ 224,707	[1]	$ 159,925	[1]
[1] (1)The balance at June 30, 2013 includes inventory acquired with the purchase of Sebree. See Note 2 Acquisition of Sebree aluminum smelter for additional information about the Sebree acquisition.

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Amount before last-in first-out (LIFO) and valuation reserves of merchandise or goods held by the entity that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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- Definition

Gross amount of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

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Gross amount of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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