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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Arrangements    
Total assets securing notes payable or held under capital leases $ 284,489 $ 272,330
Less accumulated depreciation and amortization 87,868 87,691
Net assets securing notes payable or held under capital leases 196,621 184,639
Revenue equipment    
Financing Arrangements    
Total assets securing notes payable or held under capital leases 276,268 269,950
Land and structures (service centers)    
Financing Arrangements    
Total assets securing notes payable or held under capital leases 1,794 1,794
Software    
Financing Arrangements    
Total assets securing notes payable or held under capital leases 486 486
Service, office, and other equipment    
Financing Arrangements    
Total assets securing notes payable or held under capital leases $ 5,941 $ 100