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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories, net of reserves
    June 30, 
2018
    December 31,
2017
 
Chassis   $ 7,037     $ 7,525  
Raw materials     38,399       30,109  
Work in process     12,415       13,521  
Finished goods     23,368       17,412  
    $ 81,219     $ 68,567