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Stockholders' Equity Matters (Tables)
3 Months Ended
Mar. 31, 2013
Stockholders' Equity Matters  
Schedule of dividend declared and payments
  Declaration
Date
  Dividend
Per Share
  Record
Date
  Total
Amount
  Payment
Date
   
  March 8, 2012     0.2500   March 23, 2012   $ 42,791   April 13, 2012    
  June 5, 2012     0.2700   June 22, 2012     46,336   July 13, 2012    
  September 6, 2012     0.2700   September 25, 2012     46,473   October 15, 2012    
  October 11, 2012     4.0600   October 22, 2012     700,000   November 21, 2012    
  December 14, 2012     0.2700   December 26, 2012     51,296   January 17, 2013    
  March 14, 2013     0.2700   March 25, 2013     51,460   April 15, 2013