XML 48 R31.htm IDEA: XBRL DOCUMENT v3.20.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Chassis $ 6,859 $ 6,561
Raw materials 36,161 39,444
Work in process 16,282 16,520
Finished goods 24,637 25,440
Inventories $ 83,939 $ 87,965