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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Chassis $ 7,037 $ 7,525
Raw materials 38,399 30,109
Work in process 12,415 13,521
Finished goods 23,368 17,412
Inventories $ 81,219 $ 68,567