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Equity and Equity-Based Compensation (Summary of Dividends Declated (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Common stock related:          
Dividends declared per common share (in dollars per share) $ 0.11 $ 0.1 $ 0.33 $ 0.3 $ 0.10
Dividends annualized target (in dollars per share) $ 0.44        
Series A Preferred Stock [Member]
         
Preferred stocks:          
Dividends declared per preferred share (in dollars per share)     $ 0.5344    
Percentage of preferred stock shares     8.55%    
Series D Preferred Stock [Member]
         
Preferred stocks:          
Dividends declared per preferred share (in dollars per share)     $ 0.5281    
Percentage of preferred stock shares     8.45%    
Series E Preferred Stock [Member]
         
Preferred stocks:          
Dividends declared per preferred share (in dollars per share) $ 1.01875   $ 0.5625    
Percentage of preferred stock shares     9.00%