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Basis of Presentation (Earnings per share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income $ 503,399 $ 348,620 $ 807,506 $ 552,331
Less: earnings distributed to participating securities (294) (265) (592) (538)
Less: undistributed earnings allocated to participating securities (3,731) (2,602) (5,908) (4,358)
Numerator for basic earnings per share 499,374 345,753 801,006 547,435
Add back: undistributed earnings allocated to participating securities 3,731 2,602 5,908 4,358
Less: undistributed earnings reallocated to participating securities (3,722) (2,595) (5,895) (4,342)
Numerator for diluted earnings per share $ 499,383 $ 345,760 $ 801,019 $ 547,451
Denominator:        
Basic shares outstanding (shares) 262,099 268,324 263,744 269,167
Effect of dilutive securities (shares) 648 701 627 960
Diluted shares outstanding (shares) 262,747 269,025 264,371 270,127
Earnings per share:        
Basic earnings (usd per share) $ 1.91 $ 1.29 $ 3.04 $ 2.03
Diluted earnings (usd per share) $ 1.90 $ 1.29 $ 3.03 $ 2.03