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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
INVENTORIES    
Chassis $ 3,715 $ 6,859
Raw materials 44,277 36,161
Work in process 29,470 16,282
Finished goods 14,534 24,637
Inventories $ 91,996 $ 83,939