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INVENTORIES - Schedule of Inventories, Net of Reserves (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
INVENTORIES    
Raw materials $ 86,624 $ 89,048
Work in process 44,587 47,934
Finished goods 23,948 23,077
Chassis 29,115 29,748
Total inventory 184,274 189,807
Net of inventory reserves $ 6,900 $ 5,600