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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2011
Jun. 30, 2011
years
Mar. 31, 2011
Jun. 03, 2011
Domestic Transport Inc. [Member]
Mar. 31, 2011
ETS [Member]
Acquisition date   April 1, 2011   June 3, 2011  
Acquisition of purchase price $ 90,100,000 $ 90,100,000   $ 600,000  
Purchase price     81,716,000 700,000 83,400,000
Business aquistion cash on hand   8,000,000      
Working capital adjustment 8,400,000 8,400,000      
Costs incurred prior to the acquisition     1,700,000    
Integration costs 300,000        
Due diligence and integration costs, total   2,000,000      
Goodwill amortization of period (years)   15      
Amortization expense related to acquisition 200,000 200,000      
Number of drivers       22  
Installments       25,000  
Purchase price allocation, payment       100,000  
Purchase price allocation, equipment       200,000  
Purchase price allocation, goodwill     28,918,000 400,000  
Tax deductible goodwill 25,600,000 25,600,000      
Goodwill additional tax deductible   $ 5,000,000