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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
INVENTORIES    
Chassis $ 5,767 $ 6,859
Raw materials 38,298 36,161
Work in process 27,167 16,282
Finished goods 13,708 24,637
Inventories $ 84,940 $ 83,939