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Subsequent Events (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 26, 2012
Dec. 31, 2012
Class of Stock [Line Items]    
Dividends payable, date declared   Jan. 25, 2013
Common stock, dividends declared $ 0.05  
Dividends payable, date to be paid   Feb. 20, 2031
Dividends payable, date of record   Feb. 08, 2013
Series A [Member]
   
Class of Stock [Line Items]    
Cumulative redeemable preferred stock, dividends declared $ 0.5546875  
Dividend rate percentage   8.875%
Series B [Member]
   
Class of Stock [Line Items]    
Cumulative redeemable preferred stock, dividends declared $ 0.453125  
Dividend rate percentage   7.25%