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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
 
             
   
March 31,
2014
   
December 31,
2013
 
Chassis
  $ 7,451     $ 7,665  
Raw materials
    25,329       25,772  
Work in process
    10,119       9,915  
Finished goods
    13,760       10,820  
    $ 56,659     $ 54,172