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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Arrangements      
Total assets securing notes payable or held under capital leases $ 272,330 $ 222,367  
Less accumulated depreciation and amortization 87,691 61,643  
Net assets securing notes payable or held under capital leases $ 184,639 160,724  
Weighted-average interest rate (as a percent) 2.80%    
Interest paid, net of capitalized interest $ 5,800 4,500 $ 4,000
Capitalized interest 900 700 $ 200
Revenue equipment      
Financing Arrangements      
Total assets securing notes payable or held under capital leases 269,950 220,566  
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    
Service, office, and other equipment      
Financing Arrangements      
Total assets securing notes payable or held under capital leases $ 100 $ 7