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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Chassis $ 5,836 $ 8,524
Raw materials 29,360 26,322
Work in process 12,039 11,620
Finished goods 20,326 17,670
Inventories $ 67,561 $ 64,136