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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 65,189	$ 69,776
Work-in-process	21,247	22,183
Finished goods	33,589	17,661
Operating and other supplies	132,074	129,995
Inventories	$ 252,099	$ 239,615

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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