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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Chassis $ 7,490 $ 8,048
Raw materials 31,192 28,328
Work in process 12,851 10,850
Finished goods 17,744 19,006
Inventories $ 69,277 $ 66,232