Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic earnings per share:
Net income	$ 182,844	$ 249,625	$ 528,445	$ 673,906
Weighted average common shares outstanding - basic (in shares)	281,757	302,622	286,184	309,097
Basic earnings per share (in dollars per share)	$ 0.65	$ 0.82	$ 1.85	$ 2.18
Diluted earnings per share:
Net income	$ 182,844	$ 249,625	$ 528,445	$ 673,906
Diluted income available to common shareholders	$ 183,120	$ 250,245	$ 529,470	$ 676,757
Weighted average common shares outstanding - basic (in shares)	281,757	302,622	286,184	309,097
Effect of dilutive securities:
Weighted average common shares outstanding - diluted (in shares)	285,600	307,194	289,924	315,029
Diluted earnings per share (in dollars per share)	$ 0.64	$ 0.81	$ 1.83	$ 2.15
Federal statutory income tax rate (in hundredths)	21.00%	21.00%	21.00%	21.00%
9% Convertible Junior Subordinated Debentures
Diluted earnings per share:
Dilutive securities	$ 276	$ 620	$ 1,025	$ 2,851
Effect of dilutive securities:
Dilutive securities (in shares)	1,219	2,670	1,501	4,084
Stated interest rate	9.00%		9.00%
Unvested RSUs
Effect of dilutive securities:
Unvested RSUs (in shares)	2,624	1,902	2,239	1,848