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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income $ 273,104 $ 289,535 $ 680,902 $ 784,375
Less: earnings distributed to participating securities (298) (279) (911) (874)
Less: undistributed earnings allocated to participating securities (2,411) (2,871) (6,075) (7,752)
Numerator for basic earnings per share 270,395 286,385 673,916 775,749
Add back: undistributed earnings allocated to participating securities 2,411 2,871 6,075 7,752
Less: undistributed earnings reallocated to participating securities (2,405) (2,859) (6,057) (7,724)
Numerator for diluted earnings per share $ 270,401 $ 286,397 $ 673,934 $ 775,777
Denominator:        
Basic shares outstanding (shares) 272,992 283,489 275,734 285,127
Effect of dilutive securities (shares) 640 1,183 858 1,301
Diluted shares outstanding (shares) 273,632 284,672 276,592 286,428
Earnings per share:        
Basic earnings (usd per share) $ 0.99 $ 1.01 $ 2.44 $ 2.72
Diluted earnings (usd per share) $ 0.99 $ 1.01 $ 2.44 $ 2.71