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INVENTORIES - Inventories, net of reserves (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Chassis	$ 9,516	$ 9,952
Raw materials	22,087	18,856
Work in process	8,966	7,961
Finished goods	9,404	8,276
Inventories, Total	$ 49,973	$ 45,045

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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