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Net Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventory, Net [Abstract]
Finished goods	$ 25,784	$ 26,885
Work in process	24,798	19,190
Raw materials	11,945	11,261
Supplies	4,810	4,759
Total	$ 67,337	$ 62,095

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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