LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Arrangements
Total assets securing notes payable or held under capital leases	$ 200,542	$ 138,492
Less accumulated depreciation and amortization	50,819	25,120
Net assets securing notes payable or held under capital leases	149,723	113,372
Revenue equipment
Financing Arrangements
Total assets securing notes payable or held under capital leases	198,741	136,698
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	$ 7