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Leases (Tables)
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Future Minimum Lease Payments Under Non-Cancelable Revenue Equipment Operating Leases

2012

   $  1,620   

2013

     1,620   

2014

     1,620   

2015

     608   
  

 

 

 

Total

   $ 5,468   
  

 

 

 
Rental Expense Under Non-Cancelable Revenue Equipment Operating Leases

2011

   $  1,012