LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets held under capital leases or securitized by notes payable
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS	$ 1,087,078	$ 1,079,320
Less accumulated amortization	673,074	635,292
TOTAL PROPERTY, PLANT AND EQUIPMENT, NET	414,004	444,028
Assets held under capital leases or securitized by notes payable
Assets held under capital leases or securitized by notes payable
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS	76,887	96,611
Less accumulated amortization	30,519	35,183
TOTAL PROPERTY, PLANT AND EQUIPMENT, NET	46,368	61,428
Land and structures (terminals) | Assets held under capital leases or securitized by notes payable
Assets held under capital leases or securitized by notes payable
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS	1,794	1,794
Revenue equipment | Assets held under capital leases or securitized by notes payable
Assets held under capital leases or securitized by notes payable
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS	73,590	93,004
Service, office, and other equipment | Assets held under capital leases or securitized by notes payable
Assets held under capital leases or securitized by notes payable
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS	$ 1,503	$ 1,813