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Capital Requirements (Details) (USD $)
 1 Months Ended 12 Months Ended
Apr. 30, 2009
Dec. 31, 2011
Y
Dec. 31, 2010
Capital Requirements      
Series A cumulative perpetual preferred shares, issued   216,000 216,000
Series A cumulative perpetual preferred shares, par value (in dollars per share)   $ 0.01 $ 0.01
Series A cumulative perpetual preferred shares, per share liquidation value (in dollars per share)   $ 1,000 $ 1,000
Series A cumulative perpetual preferred shares, aggregate liquidation value   $ 216,000,000  
Senior preferred stock, dividend rate for first five years (as a percent)   5.00%  
Senior preferred stock, dividend rate thereafter (as a percent)   9.00%  
Warrants to purchase entity's common stock (in shares)   1,326,238  
Warrants, exercise price (in dollars per share)   $ 24.43  
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment   15.00%  
Warrants, term (in years)   10  
Dividend payable by subsidiaries, maximum   $ 585,000,000  
Semi annual cash dividend payable, maximum (in dollars per share) $ 0.33    
Number of years following the date of investment that the entity is restricted from redeeming preferred stock   3