Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance, beginning of year at Dec. 31, 2020			$ 535,000	$ 16,749	$ 1,888,982	$ 2,078,135	$ 27,639	$ (307,739)
Net Income (Loss)	$ 824,858					824,858
Unit amortization, net of forfeitures					127,458
Distributions under employee plans					(120,158)	(35,233)		74,568
Dividends declared, Common						(74,437)
Dividends declared, Preferred						(35,587)
Issuance of preferred stock			300,000		(9,112)
Common stock issued for acquisitions					35,186			54,814
Redemption of preferred stock			(150,000)
Unrealized gains/(losses) on securities, net of tax	(19,385)	[1],[2]					(19,385)
Foreign currency translation adjustment, net of tax	(3,536)	[1],[3]					(3,536)
Other					26	(528)
Common stock repurchased								(172,741)
Balance, end of year at Dec. 31, 2021	5,034,959		685,000	16,749	1,922,382	2,757,208	4,718	(351,098)
Net Income (Loss)	662,155					662,155
Unit amortization, net of forfeitures					150,408
Distributions under employee plans					(144,658)	(65,415)		104,447
Dividends declared, Common						(148,694)
Dividends declared, Preferred						(37,281)
Issuance of preferred stock			0		0
Common stock issued for acquisitions					0			0
Redemption of preferred stock			0
Unrealized gains/(losses) on securities, net of tax	(177,731)	[1],[2]					(177,731)
Foreign currency translation adjustment, net of tax	55,053	[1],[3]					55,053
Other					(63)	1,122
Common stock repurchased	(105,800)							(105,831)
Balance, end of year at Dec. 31, 2022	5,328,471		685,000	16,749	1,928,069	3,169,095	(117,960)	(352,482)
Net Income (Loss)	522,536					522,536
Unit amortization, net of forfeitures					149,088
Distributions under employee plans					(172,154)	(83,135)		159,659
Dividends declared, Common						(172,985)
Dividends declared, Preferred						(37,281)
Issuance of preferred stock			0
Unrealized gains/(losses) on securities, net of tax	38,180	[1],[2]					38,180
Foreign currency translation adjustment, net of tax	5,454	[1],[3]					5,454
Other					94	380
Common stock repurchased	(441,300)							(443,876)
Balance, end of year at Dec. 31, 2023	$ 5,294,431		$ 685,000	$ 16,749	$ 1,905,097	$ 3,398,610	$ (74,326)	$ (636,699)

[1] Net of a tax expense of $15.4 million, tax benefit of $41.3 million, and tax benefit of $6.7 million for the years ended December 31, 2023, 2022, and 2021, respectively.

[2] Net of reclassifications to earnings of realized losses of $5.6 million for the year ended December 31, 2023. There were no reclassifications to earnings for the years ended December 31, 2022 and 2021.

[3] During the year ended December 31, 2022, we closed our derivative instruments used to hedge the foreign exchange risk related to our equity investment in non-U.S. Dollar functional currency foreign subsidiaries, primarily the British Pound and Euro. The net gain recorded on these hedges was $75.0 million, which included $23.3 million in tax expense.