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INVENTORIES - Summary of inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
INVENTORIES
Raw materials and supplies	$ 14,576	$ 15,901
Work in process	6,968	7,435
Finished goods	5,004	5,523
Total inventories	$ 26,548	$ 28,859

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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