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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Raw materials	$ 98,993	$ 78,599
Work-in-process	32,190	33,941
Finished goods	4,492	19,969
Operating and other supplies	162,139us-gaap_InventorySuppliesNetOfReserves	150,971us-gaap_InventorySuppliesNetOfReserves
Total inventories	$ 297,814us-gaap_InventoryNet	$ 283,480us-gaap_InventoryNet

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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