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Stockholder's Equity (Details 2) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Cash dividends paid or payable per share          
Dividend per Share $ 0.12 $ 0.10 $ 0.10 $ 0.22 $ 0.20
Declaration Date May 04, 2012 Feb. 21, 2012      
Record Date Jul. 09, 2012 Apr. 05, 2012      
Date Paid Jul. 23, 2012 Apr. 19, 2012