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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
 
               
   
September 30,
2014
 
December 31,
2013
 
Chassis
 
$
8,921
 
$
7,665
 
Raw materials
   
26,795
   
25,772
 
Work in process
   
14,844
   
9,915
 
Finished goods
   
15,033
   
10,820
 
   
$
65,593
 
$
54,172