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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
   

June 30,

2016

   

December 31,

2015

 
Chassis   $ 7,490     $ 8,048  
Raw materials     31,192       28,328  
Work in process     12,851       10,850  
Finished goods     17,744       19,006  
    $ 69,277     $ 66,232