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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Chassis $ 5,666 $ 7,525
Raw materials 39,523 30,109
Work in process 13,723 13,521
Finished goods 25,192 17,412
Inventories $ 84,104 $ 68,567