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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income $ 475,549 $ 416,398 $ 1,283,055 $ 968,728
Less: earnings distributed to participating securities (296) (264) (887) (799)
Less: undistributed earnings allocated to participating securities (3,546) (3,123) (9,559) (7,778)
Numerator for basic earnings per share 471,707 413,011 1,272,609 960,151
Add back: undistributed earnings allocated to participating securities 3,546 3,123 9,559 7,778
Less: undistributed earnings reallocated to participating securities (3,536) (3,116) (9,535) (7,754)
Numerator for diluted earnings per share $ 471,717 $ 413,018 $ 1,272,633 $ 960,175
Denominator:        
Basic shares outstanding (shares) 258,147 268,363 261,854 268,892
Effect of dilutive securities (shares) 752 598 668 839
Diluted shares outstanding (shares) 258,899 268,961 262,522 269,731
Earnings per share:        
Basic earnings (usd per share) $ 1.83 $ 1.54 $ 4.86 $ 3.57
Diluted earnings (usd per share) $ 1.82 $ 1.54 $ 4.85 $ 3.56