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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (Secured notes payable and capital leases, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Arrangements      
Total assets securitizing notes payable or held under capital leases $ 81,771 $ 62,165 $ 96,600
Less accumulated depreciation and amortization 30,923 26,847  
Net assets securitizing notes payable or held under capital leases 50,848 35,318 61,400
Revenue equipment
      
Financing Arrangements      
Total assets securitizing notes payable or held under capital leases 78,218 58,613  
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 $ 1,759 $ 1,758