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					113,426
Distributions under employee plans					(156,080)	(73,069)		143,071
Other					9	1,826
Net Income (Loss)	$ 360,052					360,052
Dividends declared, Common						(130,800)
Dividends declared, Preferred						(27,961)
Unrealized gains/(losses) on securities, net of tax	(17,113)	[1],[2]					(17,113)
Foreign currency translation adjustment, net of tax	914	[1]					914
Common stock repurchased	(300,152)							(300,152)
Balance, end of period at Sep. 30, 2023	5,242,594		685,000	16,749	1,885,424	3,299,143	(134,159)	(509,563)
Balance, beginning of period at Jun. 30, 2023			685,000	16,749	1,856,578	3,286,777	(104,515)	(397,602)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					35,862
Distributions under employee plans					(7,016)	(3,240)		6,849
Other						1
Net Income (Loss)	68,161					68,161
Dividends declared, Common						(43,235)
Dividends declared, Preferred						(9,321)
Unrealized gains/(losses) on securities, net of tax	(26,172)	[1],[2]					(26,172)
Foreign currency translation adjustment, net of tax	(3,472)	[1]					(3,472)
Common stock repurchased	(118,810)							(118,810)
Balance, end of period at Sep. 30, 2023	5,242,594		685,000	16,749	1,885,424	3,299,143	(134,159)	(509,563)
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					119,399
Distributions under employee plans					(152,308)	(92,168)		141,001
Other					280	(2,252)
Net Income (Loss)	487,374					487,374
Dividends declared, Common						(146,127)
Dividends declared, Preferred						(27,961)
Unrealized gains/(losses) on securities, net of tax	31,174	[1],[2]					31,174
Foreign currency translation adjustment, net of tax	2,766	[1]					2,766
Common stock repurchased	(98,529)							(98,529)
Balance, end of period at Sep. 30, 2024	5,557,080		685,000	16,749	1,872,468	3,617,476	(40,386)	(594,227)
Balance, beginning of period at Jun. 30, 2024			685,000	16,749	1,836,561	3,521,015	(84,781)	(576,337)
Issuance of preferred stock			0
Unit amortization, net of forfeitures					38,430
Distributions under employee plans					(2,610)	(1,323)		2,332
Other					87	(2,694)
Net Income (Loss)	158,505					158,505
Dividends declared, Common						(48,707)
Dividends declared, Preferred						(9,320)
Unrealized gains/(losses) on securities, net of tax	39,411	[1],[2]					39,411
Foreign currency translation adjustment, net of tax	4,984	[1]					4,984
Common stock repurchased	(20,222)							(20,222)
Balance, end of period at Sep. 30, 2024	$ 5,557,080		$ 685,000	$ 16,749	$ 1,872,468	$ 3,617,476	$ (40,386)	$ (594,227)

[1] Net of a tax expense of $16.3 million and tax benefit of $17.9 million for the three months ended September 30, 2024 and 2023, respectively. Net of a tax expense of $12.2 million and tax benefit of $6.3 million for the nine months ended September 30, 2024 and 2023, respectively.

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