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Basis Of Presentation And Significant Accounting Policies Basis of Presentation And Significant Accounting Policies (Earnings per share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income $ 2,281,884 $ 116,633 $ 2,400,063 $ 147,403
Less: earnings distributed to participating securities (273) 0 (273) 0
Less: undistributed earnings allocated to participating securities (15,884) 0 (17,526) 0
Numerator for basic earnings per share 2,265,727 116,633 2,382,264 147,403
Add back: undistributed earnings allocated to participating securities 15,884 0 17,526 0
Less: undistributed earnings reallocated to participating securities (15,753) 0 (17,358) 0
Numerator for diluted earnings per share $ 2,265,858 $ 116,633 $ 2,382,432 $ 147,403
Denominator:        
Basic shares outstanding 382,883 381,355 384,159 380,839
Effect of dilutive securities 3,220 3,215 3,745 2,036
Diluted shares outstanding 386,103 384,570 387,904 382,875
Earnings Per Share [Abstract]        
Earnings Per Share, Basic $ 5.92 $ 0.31 $ 6.20 $ 0.39
Earnings Per Share, Diluted $ 5.87 $ 0.30 $ 6.14 $ 0.38