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Stockholders' Equity Matters (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Apr. 30, 2012
Mar. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Oct. 31, 2011
Sep. 30, 2011
Jul. 31, 2011
Jun. 30, 2011
Apr. 30, 2011
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Stockholders' Equity Note                        
Share repurchases authorized amount                     $ 1,200,000  
Remaining amount available under share repurchase program                     66,035  
Percentage of outstanding common stock authorized for repurchase                     1.00%  
Dividends declared (in dollars per share)   $ 0.2500   $ 0.2500   $ 0.2500   $ 0.2500   $ 0.1875 $ 0.2500 $ 0.1875
Dividends declared   42,791   43,180   46,877   50,694   37,601 42,791 37,601
Dividends paid ( in dollars per share)   $ 0.2500   $ 0.2500   $ 0.2500   $ 0.2500   $ 0.1875    
Dividends paid $ 42,791   $ 43,180   $ 46,877   $ 50,694   $ 37,601   $ 43,180 $ 37,514