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Subsequent Events (Tables)
6 Months Ended
Jun. 30, 2011
Subsequent Events  
Schedule of Dividends Declared

Class

   Quarterly
Amount/Share
     Record Date      Payment Date  

Common

   $ 0.17         August 17, 2011         August 31, 2011   

Preferred (per depositary share):

        

Series J

   $ 0.414063         August 17, 2011         August 31, 2011   

Series K

   $ 0.406250         August 17, 2011         August 31, 2011   

Series L

   $ 0.412500         August 17, 2011         August 31, 2011   

Series M

   $ 0.434375         September 16, 2011         September 30, 2011   

Series O

   $ 0.523438         September 16, 2011         September 30, 2011