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Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2011
Comprehensive Income  
Schedule Of Comprehensive Income
                 
    June 30, 2011     June 30, 2010  
Quarter Ended
  $ 35,965,412     $ 23,884,823  
Six Months Ended
  $ 83,278,217     $ 57,763,874