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INVENTORIES - Summary of inventories, net of reserves (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Chassis	$ 7,451	$ 7,665
Raw materials	25,329	25,772
Work in process	10,119	9,915
Finished goods	13,760	10,820
Inventories	$ 56,659	$ 54,172

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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