Consolidated Statements Of 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, 2021			$ 685,000	$ 16,749	$ 1,922,382	$ 2,757,208	$ 4,718	$ (351,098)
Unit amortization, net of forfeitures					81,178
Issuance of preferred stock			0
Net income	$ 334,365					334,365
Dividends declared, Common						(74,532)
Dividends declared, Preferred						(18,641)
Distributions under employee plans					(119,167)	(50,911)		82,060
Common stock repurchased								(30,666)
Unrealized gains/(losses) on securities, net of tax	(135,530)	[1],[2]					(135,530)
Foreign currency translation adjustment, net of tax	20,769	[1]					20,769
Other					62	791
Balance, end of period at Jun. 30, 2022	5,124,737		685,000	16,749	1,884,455	2,948,280	(110,043)	(299,704)
Balance, beginning of period at Mar. 31, 2022			685,000	16,749	1,852,276	2,834,224	(62,604)	(271,301)
Unit amortization, net of forfeitures					35,013
Issuance of preferred stock			0
Net income	160,816					160,816
Dividends declared, Common						(37,400)
Dividends declared, Preferred						(9,321)
Distributions under employee plans					(2,815)	(927)		2,263
Common stock repurchased	(30,700)							(30,666)
Unrealized gains/(losses) on securities, net of tax	(57,699)	[1],[2]					(57,699)
Foreign currency translation adjustment, net of tax	10,260	[1]					10,260
Other					(19)	888
Balance, end of period at Jun. 30, 2022	5,124,737		685,000	16,749	1,884,455	2,948,280	(110,043)	(299,704)
Balance, beginning of period at Dec. 31, 2022	5,328,471		685,000	16,749	1,928,069	3,169,095	(117,960)	(352,482)
Unit amortization, net of forfeitures					77,564
Issuance of preferred stock			0
Net income	291,891					291,891
Dividends declared, Common						(87,565)
Dividends declared, Preferred						(18,640)
Distributions under employee plans					(149,064)	(69,829)		136,222
Common stock repurchased	(181,300)							(181,342)
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
Other					9	1,825
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)
Unit amortization, net of forfeitures					37,783
Issuance of preferred stock			0
Net income	134,352					134,352
Dividends declared, Common						(43,837)
Dividends declared, Preferred						(9,320)
Distributions under employee plans					(11,844)	(6,056)		12,207
Common stock repurchased	(86,800)							(86,821)
Unrealized gains/(losses) on securities, net of tax	(13,651)	[1],[2]					(13,651)
Foreign currency translation adjustment, net of tax	957	[1]					957
Other					2	1,823
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)

[1] Net of tax benefit of $4.4 million and $17.0 million for the three months ended June 30, 2023 and 2022, respectively. Net of tax expense of $4.6 million and tax benefit of $38.2 million for the six months ended June 30, 2023 and 2022, respectively.

[2] 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. There were no reclassifications to earnings for the three and six months ended June 30, 2022.