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LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Assets securing notes (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financing Arrangements    
Total assets securing notes payable or held under finance leases $ 353,164 $ 353,093
Less accumulated depreciation and amortization 135,538 115,424
Net assets securing notes payable or held under finance leases 217,626 237,669
Revenue equipment    
Financing Arrangements    
Total assets securing notes payable or held under finance leases 326,914 326,823
Service, office, and other equipment    
Financing Arrangements    
Total assets securing notes payable or held under finance leases $ 26,250 $ 26,270