LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Assets Securing Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Arrangements
Total assets securing notes payable or held under finance leases	$ 313,968	$ 271,665
Less accumulated depreciation and amortization	106,769	88,696
Net assets securing notes payable or held under finance leases	207,199	182,969
Revenue equipment
Financing Arrangements
Total assets securing notes payable or held under finance leases	274,540	241,892
Service, office, and other equipment
Financing Arrangements
Total assets securing notes payable or held under finance leases	$ 39,428	$ 29,773