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INVENTORIES - Summary of inventories, net of reserves (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Chassis $ 4,804 $ 4,700
Raw materials 26,431 24,291
Work in process 10,752 10,477
Finished goods 15,567 16,992
Inventories $ 57,554 $ 56,460