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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Chassis $ 18,604 $ 5,753
Raw materials 75,934 59,651
Work in process 40,655 33,994
Finished goods 18,463 15,510
Inventories $ 153,656 $ 114,908