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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventory, Net [Abstract]
Raw materials	$ 42,557	$ 41,142
Work-in-process	15,932	15,548
Finished goods	10,886	10,535
Operating and other supplies	100,927	104,736
Inventories	$ 170,302	$ 171,961

X

- Definition

Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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- Definition

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

Carrying amount as of the balance sheet date 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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Carrying amount as of the balance sheet date 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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