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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
INVENTORIES    
Chassis $ 7,500 $ 6,561
Raw materials 39,255 39,444
Work in process 15,592 16,520
Finished goods 25,101 25,440
Inventories $ 87,448 $ 87,965