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Stockholder's Equity (Details 2) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended
Nov. 06, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Cash dividends paid or payable per share              
Dividend per Share, common stock   $ 0.12 $ 0.1200 $ 0.1000 $ 0.10 $ 0.34 $ 0.30
Dividend per Share, preferred stock $ 0.484375            
Common Stock [Member]
             
Cash dividends paid or payable per share              
Declaration Date   Aug. 03, 2012 May 04, 2012 Feb. 21, 2012      
Record Date   Oct. 05, 2012 Jul. 09, 2012 Apr. 05, 2012      
Date Paid   Oct. 26, 2012 Jul. 23, 2012 Apr. 19, 2012      
Preferred Stock [Member]
             
Cash dividends paid or payable per share              
Declaration Date   Aug. 03, 2012          
Record Date   Sep. 10, 2012          
Date Paid   Oct. 01, 2012          
Dividend per Share, preferred stock   $ 0.3875