Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Basic earnings per share:
Net income	$ 204,228	$ 191,054	$ 378,325	$ 345,601
Weighted average common shares outstanding - basic (in shares)	265,315	285,906	267,814	288,434
Basic earnings per share (in dollars per share)	$ 0.77	$ 0.67	$ 1.41	$ 1.20
Diluted earnings per share:
Net income	$ 204,228	$ 191,054	$ 378,325	$ 345,601
Dilutive securities	0	375	0	750
Diluted income available to common shareholders	$ 204,228	$ 191,429	$ 378,325	$ 346,351
Weighted average common shares outstanding - basic (in shares)	265,315	285,906	267,814	288,434
Effect of dilutive securities:
Unvested RSUs (in shares)	1,557	2,016	2,176	2,047
Dilutive securities (in shares)	0	1,644	0	1,644
Weighted average common shares outstanding - diluted (in shares)	266,872	289,566	269,990	292,125
Diluted earnings per share (in dollars per share)	$ 0.77	$ 0.66	$ 1.40	$ 1.19
Federal statutory income tax rate (in hundredths)	21.00%	21.00%	21.00%	21.00%
9% Convertible Junior Subordinated Debentures
Effect of dilutive securities:
Stated interest rate		9.00%		9.00%