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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets securitized by notes payable or held under capital leases    
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS $ 1,094,590 $ 1,079,320
Less accumulated amortization 700,193 635,292
TOTAL PROPERTY, PLANT AND EQUIPMENT, NET 394,397 444,028
Assets securitized by notes payable or held under capital leases
    
Assets securitized by notes payable or held under capital leases    
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS 3,552 3,607
Less accumulated amortization 26,847 35,183
TOTAL PROPERTY, PLANT AND EQUIPMENT, NET (23,295) (31,576)
Land and structures (terminals) | Assets securitized by notes payable or held under capital leases
    
Assets securitized by notes payable or held under capital leases    
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS 1,794 1,794
Revenue equipment | Assets securitized by notes payable or held under capital leases
    
Assets securitized by notes payable or held under capital leases    
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS 58,613 93,004
Service, office, and other equipment | Assets securitized by notes payable or held under capital leases
    
Assets securitized by notes payable or held under capital leases    
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS $ 1,758 $ 1,813