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
Balance, beginning of period at Dec. 31, 2020			$ 535,000	$ 16,749	$ 1,888,982	$ 2,078,135	$ 27,639	$ (307,739)
Common stock repurchased	$ (41,700)							(41,007)
Unit amortization, net of forfeitures					64,245
Distributions under employee plans					(106,297)	(29,146)		65,628
Net income	371,092					371,092
Dividends declared, Common						(37,304)
Dividends declared, Preferred						(16,578)
Unrealized gains/(losses) on securities, net of tax	(5,118)	[1],[2]					(5,118)
Foreign currency translation adjustment, net of tax	4,745	[1]					4,745
Other					56	(292)
Balance, end of period at Jun. 30, 2021	4,508,790		535,000	16,749	1,846,986	2,365,907	27,266	(283,118)
Balance, beginning of period at Mar. 31, 2021			535,000	16,749	1,814,616	2,202,701	7,305	(257,499)
Common stock repurchased	(29,000)							(28,969)
Unit amortization, net of forfeitures					29,434
Distributions under employee plans					(2,927)	(7,559)		3,350
Net income	198,077					198,077
Dividends declared, Common						(18,834)
Dividends declared, Preferred						(8,289)
Unrealized gains/(losses) on securities, net of tax	17,552	[1],[2]					17,552
Foreign currency translation adjustment, net of tax	2,409	[1]					2,409
Other					9	(189)
Balance, end of period at Jun. 30, 2021	4,508,790		535,000	16,749	1,846,986	2,365,907	27,266	(283,118)
Balance, beginning of period at Dec. 31, 2021	5,034,959		685,000	16,749	1,922,382	2,757,208	4,718	(351,098)
Common stock repurchased	(30,700)							(30,666)
Unit amortization, net of forfeitures					81,178
Distributions under employee plans					(119,167)	(50,911)		82,060
Net income	334,365					334,365
Dividends declared, Common						(74,532)
Dividends declared, Preferred						(18,641)
Unrealized gains/(losses) on securities, net of tax	(135,530)	[1],[2]					(135,530)
Unrealized gains on cash flow hedging activities, net of tax							38,339
Foreign currency translation adjustment, net of tax	(17,570)	[1]					(17,570)
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)
Common stock repurchased	(30,700)							(30,666)
Unit amortization, net of forfeitures					35,013
Distributions under employee plans					(2,815)	(927)		2,263
Net income	160,816					160,816
Dividends declared, Common						(37,400)
Dividends declared, Preferred						(9,321)
Unrealized gains/(losses) on securities, net of tax	(57,699)	[1],[2]					(57,699)
Unrealized gains on cash flow hedging activities, net of tax							24,746
Foreign currency translation adjustment, net of tax	(14,486)	[1]					(14,486)
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)

[1] Net of tax benefit of $17.0 million and tax expense of $6.6 million for the three months ended June 30, 2022 and 2021, respectively. Net of tax benefit of $38.2 million and tax benefit of $0.2 million for the six months ended June 30, 2022 and 2021, respectively.

[2] There were no reclassifications to earnings for the three and six months ended June 30, 2022 and 2021.