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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 677,346	$ 764,883
Supplies	381,695us-gaap_InventorySuppliesNetOfReserves	374,599us-gaap_InventorySuppliesNetOfReserves
Work in progress	100,408	128,882
Finished goods	293,793	350,055
Total inventories	$ 1,453,242us-gaap_InventoryNet	$ 1,618,419us-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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