Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic earnings per share:
Net income	$ 199,969	$ 182,844	$ 578,294	$ 528,445
Weighted average common shares outstanding - basic (in shares)	258,596	281,757	264,719	286,184
Basic earnings per share (in dollars per share)	$ 0.77	$ 0.65	$ 2.18	$ 1.85
Diluted earnings per share:
Net income	$ 199,969	$ 182,844	$ 578,294	$ 528,445
Dilutive securities	0	276	0	1,025
Diluted income available to common shareholders	$ 199,969	$ 183,120	$ 578,294	$ 529,470
Weighted average common shares outstanding - basic (in shares)	258,596	281,757	264,719	286,184
Effect of dilutive securities:
Unvested RSUs (in shares)	2,237	2,624	2,196	2,239
Dilutive securities (in shares)	0	1,219	0	1,501
Weighted average common shares outstanding - diluted (in shares)	260,833	285,600	266,915	289,924
Diluted earnings per share (in dollars per share)	$ 0.77	$ 0.64	$ 2.17	$ 1.83
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%