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Dividends
9 Months Ended
Sep. 30, 2011
Dividends [Abstract] 
Dividends
Note 6. Dividends
     The following table sets forth the quarterly dividends declared by our Board of Directors for the periods covered in this report:
                         
    Dividend     Aggregate          
    per Common     Dividend          
Declaration Date   Share     Amount     Record Date   Payment Date
December 14, 2009
  $ 0.10     $ 7,955     December 31, 2009   January 15, 2010
March 12, 2010
  $ 0.10       7,951     March 31, 2010   April 15, 2010
May 25, 2010
  $ 0.10       7,947     June 30, 2010   July 15, 2010
September 21, 2010
  $ 0.10       7,947     September 30, 2010   October 15, 2010
December 6, 2010
  $ 0.10       7,964     December 31, 2010   January 14, 2011
March 8, 2011
  $ 0.10       7,857     March 31, 2011   April 15, 2011
June 27, 2011
  $ 0.125       9,364     July 7, 2011   July 15, 2011
September 14, 2011
  $ 0.125       9,035     September 30, 2011   October 14, 2011