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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Finished goods	$ 54,302	$ 53,957
Work in process	71,086	70,388
Raw materials	40,689	52,994
Supplies	28us-gaap_InventorySuppliesNetOfReserves	60us-gaap_InventorySuppliesNetOfReserves
Inventory, Net	$ 166,105us-gaap_InventoryNet	$ 177,399us-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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