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

September 30,

2016

    December 31,
2015
 
Chassis   $ 7,414     $ 8,048  
Raw materials     28,868       28,328  
Work in process     12,693       10,850  
Finished goods     15,863       19,006  
    $ 64,838     $ 66,232