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INVENTORY - Schedule of Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
INVENTORY    
Chassis $ 29,748 $ 18,604
Raw materials 89,048 75,934
Work in process 47,934 40,655
Finished goods 23,077 18,463
Inventories 189,807 153,656
Net of inventory reserves $ 5,600 $ 5,900