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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
           
    September 30,
2015
  December 31,
2014
 
Chassis   $ 4,650   $ 4,700  
Raw materials     29,925     24,291  
Work in process     10,658     10,477  
Finished goods     19,249     16,992  
    $ 64,482   $ 56,460