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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventories
Raw materials	$ 644,142	$ 609,150
Supplies	258,061	251,716
Work-in-progress	106,110	106,609
Finished goods	262,628	232,109
Total inventories	$ 1,270,941	$ 1,199,584

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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