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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories
Finished goods	$ 264,237	$ 275,169
Raw materials and precious metals	161,492	164,287
In-process inventories	54,310	42,767
Parts and supplies	45,066	45,847
Inventories	$ 525,105	$ 528,070

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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