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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventories
Raw materials	$ 614,098	$ 660,384
Supplies	288,631	293,533
Work in progress	130,908	84,710
Finished goods	287,234	276,120
Total inventories	$ 1,320,871	$ 1,314,747

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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