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Changes in Operations (Details)
6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
United States Revolving Loan [Member]
FreightLink [Member]
USD ($)
Dec. 31, 2010
Australia Revolving Loan [Member]
FreightLink [Member]
USD ($)
Dec. 31, 2010
Australia Revolving Loan [Member]
FreightLink [Member]
AUD
Jun. 30, 2011
FreightLink [Member]
Dec. 31, 2011
FreightLink [Member]
USD ($)
Dec. 31, 2011
FreightLink [Member]
AUD
Dec. 01, 2010
FreightLink [Member]
USD ($)
Dec. 01, 2010
FreightLink [Member]
AUD
Jun. 30, 2011
Australia
Business Acquisition, Cost of Acquired Entity, Purchase Price               $ 320,019,000 331,936,000  
Long-term debt assumed               1,741,000 1,806,000  
Non-interest bearing loan               48,200,000 50,000,000  
Debt Instrument, Maturity Date Jul. 29, 2016 Jan. 14, 2054
Concession Agreement Expiration Date Jan. 14, 2054
Business acquisition revenue to be eliminated           26,800,000 25,000,000      
Foreign Currency Exchange Rate, Translation               0.96 0.96  
Purchase of FreightLink assets through borrowings   $ 100,000,000 $ 94,000,000 97,000,000            
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate                   30.00%