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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
INVENTORIES    
Chassis $ 7,335 $ 8,921
Raw materials 40,468 40,021
Work in process 17,468 14,995
Finished goods 32,801 29,830
Inventories $ 98,072 $ 93,767