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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
  

June 30,

2017

  December 31,
2016
 
Chassis $6,744  $8,524 
Raw materials  29,423   26,322 
Work in process  13,119   11,620 
Finished goods  18,945   17,670 
  $68,231  $64,136