LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (Secured notes payable and capital leases, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	$ 88,126	$ 90,640
Less accumulated amortization	28,876	26,305
Net assets securitizing notes payable or held under capital leases	59,250	64,335
Revenue equipment
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	86,076	88,591
Land and structures (terminals)
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	1,794	1,794
Service, office, and other equipment
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	$ 256	$ 255