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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory [Line Items]
Finished goods	$ 53,957	$ 39,988
Work in process	70,388	60,227
Raw materials	52,994	16,424
Supplies	60	32
Inventory, Net	$ 177,399	$ 116,671

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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