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Inventories (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Inventories
Raw materials	$ 598,699	$ 589,859
Supplies	239,052	231,816
Work-in-progress	140,328	94,346
Finished goods	217,115	198,042
Total inventories	$ 1,195,194	$ 1,114,063

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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