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INVENTORIES - Inventories, net of reserves (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Chassis $ 8,944 $ 9,952
Raw materials 23,740 18,856
Work in process 9,794 7,961
Finished goods 8,930 8,276
Inventories, Total $ 51,408 $ 45,045