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Subsequent Event (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Subsequent Event (Textual) [Abstract]        
Dividends per common share $ 0.20 $ 0.10 $ 0.35 $ 0.20
Date of Dividend Payable Sep. 21, 2012      
Dividends Payable, Date of Record Aug. 17, 2012   Jul. 27, 2012