Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent	Treasury Stock, Common [Member]
Balance, beginning of period at Dec. 31, 2022			$ 685,000	$ 16,749	$ 1,928,069	$ 3,169,095	$ (117,960)	$ (352,482)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					77,564
Distributions under employee plans					(149,064)	(69,829)		136,222
Other					9	1,825
Net income	$ 291,891					291,891
Dividends declared, Common						(87,565)
Dividends declared, Preferred						(18,640)
Unrealized gains/(losses) on securities, net of tax	9,059	[1],[2]					9,059
Foreign currency translation adjustment, net of tax	4,386	[1]					4,386
Common stock repurchased	(181,341)							(181,342)
Balance, end of period at Jun. 30, 2023	5,342,987		685,000	16,749	1,856,578	3,286,777	(104,515)	(397,602)
Balance, beginning of period at Mar. 31, 2023			685,000	16,749	1,830,637	3,209,815	(91,821)	(322,988)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					37,783
Distributions under employee plans					(11,844)	(6,056)		12,207
Other					2	1,823
Net income	134,352					134,352
Dividends declared, Common						(43,837)
Dividends declared, Preferred						(9,320)
Unrealized gains/(losses) on securities, net of tax	(13,651)	[1],[2]					(13,651)
Foreign currency translation adjustment, net of tax	957	[1]					957
Common stock repurchased	(86,821)							(86,821)
Balance, end of period at Jun. 30, 2023	5,342,987		685,000	16,749	1,856,578	3,286,777	(104,515)	(397,602)
Balance, beginning of period at Dec. 31, 2023	5,294,431		685,000	16,749	1,905,097	3,398,610	(74,326)	(636,699)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					80,969
Distributions under employee plans					(149,698)	(90,845)		138,669
Other					193	442
Net income	328,869					328,869
Dividends declared, Common						(97,420)
Dividends declared, Preferred						(18,641)
Unrealized gains/(losses) on securities, net of tax	(8,237)	[1],[2]					(8,237)
Foreign currency translation adjustment, net of tax	(2,218)	[1]					(2,218)
Common stock repurchased	(78,306)							(78,307)
Balance, end of period at Jun. 30, 2024	5,398,207		685,000	16,749	1,836,561	3,521,015	(84,781)	(576,337)
Balance, beginning of period at Mar. 31, 2024			685,000	16,749	1,805,717	3,414,744	(84,174)	(564,095)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					38,812
Distributions under employee plans					(7,893)	(885)		5,355
Other					(75)	(5)
Net income	165,294					165,294
Dividends declared, Common						(48,812)
Dividends declared, Preferred						(9,321)
Unrealized gains/(losses) on securities, net of tax	(33)	[1],[2]					(33)
Foreign currency translation adjustment, net of tax	(574)	[1]					(574)
Common stock repurchased	(17,597)							(17,597)
Balance, end of period at Jun. 30, 2024	$ 5,398,207		$ 685,000	$ 16,749	$ 1,836,561	$ 3,521,015	$ (84,781)	$ (576,337)

[1] Net of tax benefits of $0.2 million and $4.4 million for the three months ended June 30, 2024 and 2023, respectively. Net of a tax benefit of $3.7 million and tax expense of 4.6 million for the six months ended June 30, 2024 and 2023, respectively.

[2] There were no reclassifications to earnings for the six months ended June 30, 2024. There were no reclassifications to earnings for the three months ended June 30, 2023. Net of reclassifications to earnings of realized losses of $5.6 million for the six months ended June 30, 2023.