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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
             
   
June 30,
2014
   
December 31,
2013
 
Chassis
  $ 5,694     $ 7,665  
Raw materials
    25,339       25,772  
Work in process
    10,525       9,915  
Finished goods
    13,619       10,820  
    $ 55,177     $ 54,172