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INVENTORIES - Summary of inventories, net of reserves (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Chassis $ 5,694 $ 7,665
Raw materials 25,339 25,772
Work in process 10,525 9,915
Finished goods 13,619 10,820
Inventories $ 55,177 $ 54,172