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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
             
   
March 31,
2015
   
December 31,
2014
 
Chassis
  $ 7,790     $ 4,700  
Raw materials
    25,351       24,291  
Work in process
    10,400       10,477  
Finished goods
    18,232       16,992  
    $ 61,773     $ 56,460