Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic earnings per share:
Net income	$ 249,625	$ 157,977	$ 673,906	$ 461,049
Weighted average common shares outstanding - basic (in shares)	302,622	335,938	309,097	338,045
Basic earnings per share (in dollars per share)	$ 0.82	$ 0.47	$ 2.18	$ 1.36
Diluted earnings per share:
Net income	$ 249,625	$ 157,977	$ 673,906	$ 461,049
Diluted income available to common shareholders	$ 250,245	$ 161,689	$ 676,757	$ 472,184
Weighted average common shares outstanding - basic (in shares)	302,622	335,938	309,097	338,045
Effect of dilutive securities:
Weighted average common shares outstanding - diluted (in shares)	307,194	353,557	315,029	355,481
Diluted earnings per share (in dollars per share)	$ 0.81	$ 0.46	$ 2.15	$ 1.33
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	$ 620	$ 3,712	$ 2,851	$ 11,135
Effect of dilutive securities:
Dilutive securities (in shares)	2,670	15,785	4,084	15,785
Stated interest rate	9.00%		9.00%
Unvested RSUs
Effect of dilutive securities:
Unvested RSUs (in shares)	1,902	1,834	1,848	1,651