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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Chassis $ 5,753 $ 6,859
Raw materials 59,651 36,161
Work in process 33,994 16,282
Finished goods 15,510 24,637
Inventories $ 114,908 $ 83,939