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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
    March 31,
2018
    December 31,
2017
 
Chassis   $ 8,908     $ 7,525  
Raw materials     34,144       30,109  
Work in process     13,962       13,521  
Finished goods     20,639       17,412  
    $ 77,653     $ 68,567