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Amtrak Agreement (Tables)
 6 Months Ended
Jun. 30, 2012
Amtrak Agreement [Abstract]  
Schedule of remaining track mileage credit
                                 
    Three Months Ended
June 30,		     Six Months Ended
June 30,		  
    2012     2011     2012     2011  

Mileage credit available

   $ 2,571     $ —       $ 2,571     $ —    

Utilized

     147       —         147       —    
   

 

 

    

 

 

    

 

 

    

 

 

  

Mileage credit remaining

   $ 2,424     $ —       $ 2,424     $ —