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Property, Equipment and Depreciation (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Property, Plant and Equipment [Line Items]    
Amortization Period of Tires  2 years 
Percentage of Tractor Fleet Depreciated at 150%89.00% 89.00% 
Depreciation$ 14,900,000$ 15,139,000$ 40,942,000$ 46,241,000
Tractors [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment, Salvage Value15,000 15,000 
Trailers [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment, Salvage Value4,000 4,000 
Communications and Utilities Expense [Member]
    
Property, Plant and Equipment [Line Items]    
Depreciation$ 166,000 $ 484,000