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INVENTORY (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 15,484	$ 16,079
Work-in-process	11,172	12,133
Finished goods	18,917	19,155
Supplies	1,289	953
Total inventory	$ 46,862	$ 48,320

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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