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INVENTORIES - Summary of inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure
Raw materials	$ 17,205	$ 15,892
Work in process	6,597	5,691
Finished goods	4,357	3,324
Total inventories	$ 28,159	$ 24,907

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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