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Net Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory, Net [Abstract]
Finished goods	$ 33,143	$ 30,262
Work in process	37,785	23,533
Raw materials	20,696	12,352
Supplies	5,141	5,074
Total	$ 96,765	$ 71,221

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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