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Basis of Presentation (Earnings per share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income $ 416,398 $ 273,104 $ 968,728 $ 680,902
Less: earnings distributed to participating securities (264) (298) (799) (911)
Less: undistributed earnings allocated to participating securities (3,123) (2,411) (7,778) (6,075)
Numerator for basic earnings per share 413,011 270,395 960,151 673,916
Add back: undistributed earnings allocated to participating securities 3,123 2,411 7,778 6,075
Less: undistributed earnings reallocated to participating securities (3,116) (2,405) (7,754) (6,057)
Numerator for diluted earnings per share $ 413,018 $ 270,401 $ 960,175 $ 673,934
Denominator:        
Basic shares outstanding (shares) 268,363 272,992 268,892 275,734
Effect of dilutive securities (shares) 598 640 839 858
Diluted shares outstanding (shares) 268,961 273,632 269,731 276,592
Earnings per share:        
Basic earnings (usd per share) $ 1.54 $ 0.99 $ 3.57 $ 2.44
Diluted earnings (usd per share) $ 1.54 $ 0.99 $ 3.56 $ 2.44