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Subsequent Events (Details) (USD $)
0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jul. 27, 2012
Jun. 30, 2012
Jul. 30, 2012
Series A [Member]
Jun. 30, 2012
Series A [Member]
Jul. 30, 2012
Series B [Member]
Jun. 30, 2012
Series B [Member]
Dividends payable, date declared   Jul. 30, 2012        
Common stock, dividends declared $ 0.05          
Cumulative redeemable preferred stock, dividends declared     $ 0.5546875   $ 0.453125  
Dividends payable, date to be paid   Aug. 20, 2012        
Dividends payable, date of record   Aug. 10, 2012        
Preferred Stock, Dividend Rate, Percentage       8.875%   7.25%