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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories
Raw materials	$ 526,280	$ 594,388
Supplies	277,400	278,494
Work-in-progress	113,542	82,934
Finished goods	252,937	246,691
Total inventories	$ 1,170,159	$ 1,202,507

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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