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Preferred Stock, Common Stock and Dividends (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended
Oct. 31, 2011
Aug. 31, 2011
May 31, 2011
Apr. 30, 2011
Mar. 31, 2011
Feb. 28, 2011
Apr. 30, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
year
segment
entity
day
trust
semiannual
quarter
Sep. 30, 2010
Nov. 15, 2011
Mar. 10, 2011
M
Dec. 31, 2010
Apr. 07, 2009
M
Dec. 23, 2008
Preferred Stock, Common Stock and Dividends                
Series A cumulative perpetual preferred shares, issued (in shares)       216,000 216,000   216,000  
Series A Cumulative perpetual preferred shares, par value (in dollars per share)       $ 0.01 $ 0.01   $ 0.01  
Series A Cumulative perpetual preferred shares, per share liquidation value (in dollars per share)       $ 1,000 $ 1,000   $ 1,000  
Series A cumulative perpetual preferred shares, aggregate liquidation value       $ 216,000,000 $ 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 1,326,238      
Warrants, exercise price (in dollars per share)       $ 24.43 $ 24.43      
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment (as a percent)         15.00%      
Warrants, term (in years)         10      
Senior preferred stock, dividend paid 2,700,0002,700,000  2,700,000          
Senior preferred stock, future payment           2,700,000    
Series A cumulative perpetual preferred shares, fair value as if issued on a stand-alone basis       130,900,000 130,900,000      
Warrants, fair value as if issued on a stand-alone basis       8,000,000 8,000,000      
Series A Cumulative perpetual preferred shares, discount       6,088,000 6,088,000   7,932,000 12,400,000
Period of amortization of discount on preferred shares (in years)         5      
Amortization of discount on series A cumulative perpetual preferred shares       624,000586,0001,844,0001,731,000     
Cash dividends paid to common shareholders (in dollars per share)$ 0.19  $ 0.19            
Semi annual cash dividend payable, maximum (in dollars per share)      $ 0.33         
Repurchase of common stock, authorized amount    40,000,000 40,000,000         
Period of repurchase of common stock (in months)            12 12 
Cumulative number of shares repurchased under all stock repurchase programs (in shares)7,747,827               
Cumulative cost of shares repurchased under all stock repurchase programs$ 235,819,000