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INVENTORIES (Schedule of Inventories, Net of Reserves) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
INVENTORIES    
Chassis $ 6,664 $ 5,753
Raw materials 62,628 59,651
Work in process 38,398 33,994
Finished goods 16,658 15,510
Inventories $ 124,348 $ 114,908