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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Chassis $ 18,125 $ 18,604
Raw materials 77,852 75,934
Work in process 42,588 40,655
Finished goods 25,866 18,463
Inventories $ 164,431 $ 153,656