Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic earnings per share:
Net income	$ 154,547	$ 175,013
Weighted average common shares outstanding - basic (in shares)	290,989	315,975
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.55
Diluted earnings per share:
Net income	$ 154,547	$ 175,013
Diluted income available to common shareholders	$ 154,922	$ 176,525
Weighted average common shares outstanding - basic (in shares)	290,989	315,975
Effect of dilutive securities:
Weighted average common shares outstanding - diluted (in shares)	294,712	324,538
Diluted earnings per share (in dollars per share)	$ 0.53	$ 0.54
Federal statutory income tax rate (in hundredths)	21.00%	21.00%
9% Convertible Junior Subordinated Debentures
Diluted earnings per share:
Dilutive securities	$ 375	$ 1,512
Effect of dilutive securities:
Dilutive securities (in shares)	1,644	6,534
Stated interest rate	9.00%
Unvested RSUs
Effect of dilutive securities:
Unvested RSUs (in shares)	2,079	2,029