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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic earnings per share [Abstract]      
Net income $ 712,949 $ 865,349 $ 634,983
Weighted average common shares outstanding - basic (in shares) 283,605 305,847 334,330
Basic earnings per share (in dollars per share) $ 2.51 $ 2.83 $ 1.90
Diluted earnings per share [Abstract]      
Net income $ 712,949 $ 865,349 $ 634,983
Diluted income available to common shareholders $ 713,975 $ 868,577 $ 649,326
Weighted-average shares - basic (in shares) 283,605 305,847 334,330
Effect of dilutive securities [Abstract]      
Weighted-average shares - diluted (in shares) 287,155 311,229 351,308
Diluted income per share (in dollars per share) $ 2.49 $ 2.79 $ 1.85
Federal statutory income tax rate (in hundredths) 21.00% 21.00% 21.00%
9% Convertible Junior Subordinated Debentures due 2063      
Diluted earnings per share [Abstract]      
Dilutive securities $ 1,026 $ 3,228 $ 14,343
Effect of dilutive securities [Abstract]      
Dilutive securities (in shares) 1,123 3,465 15,196
Stated interest rate (in hundredths) 9.00% 9.00% 9.00%
Unvested Restricted Stock Units      
Effect of dilutive securities [Abstract]      
Dilutive securities - Share based compensation (in shares) 2,427 1,917 1,782