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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventories
Finished goods	$ 323,315	$ 110,788
Raw materials and precious metals	157,931	89,333
In-process inventories	115,372	22,931
Parts and supplies	39,603	24,120
Inventories	$ 636,221	$ 247,172

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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