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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Arrangements    
Total assets securing notes payable or held under capital leases $ 111,428 $ 90,640
Less accumulated depreciation and amortization 20,340 26,305
Net assets securing notes payable or held under capital leases 91,088 64,335
Revenue equipment    
Financing Arrangements    
Total assets securing notes payable or held under capital leases 109,379 88,591
Land and structures (terminals)    
Financing Arrangements    
Total assets securing notes payable or held under capital leases 1,794 1,794
Service, office, and other equipment    
Financing Arrangements    
Total assets securing notes payable or held under capital leases $ 255 $ 255