Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Adjustments for Accounting Changes [Member]	[1]	AOCI Attributable to Parent	Treasury Stock at Cost [Member]	Parent [Member]	Non-controlling Interests [Member]
Balance, beginning of period at Dec. 31, 2018			$ 150,000	$ 11,166	$ 1,893,304	$ 1,366,503	$ (11,204)		$ (72,523)	$ (180,857)		$ 30,000
Common stock repurchased	$ (180,400)									(180,434)
Unit amortization, net of forfeitures					86,388
Distributions under employee plans					(84,902)	(18,770)				71,793
Net income	317,706					319,318
Dividends declared, Common						(38,249)
Dividends declared, Preferred						(12,476)
Issuance of preferred stock			160,000		(5,012)
Unrealized gains on securities, net of tax	58,428	[2],[3]							58,428
Unrealized gains/(losses) on cash flow hedging activities, net of tax									(4,260)
Foreign currency translation adjustment, net of tax	(5,239)								(5,239)
Other					37	(1,296)
Capital contributions from non-controlling interest holders												26,800
Distributions to non-controlling interest holders												(2,379)
Deconsolidation of non-controlling interest												1,612
Balance, end of period at Sep. 30, 2019	3,557,748		310,000	11,166	1,889,815	1,603,826			(23,594)	(289,498)	$ 3,501,715	56,033
Balance, beginning of period at Jun. 30, 2019			310,000	11,166	1,867,209	1,512,702	(395)		(35,355)	(236,596)		56,296
Common stock repurchased	(55,500)									(55,468)
Unit amortization, net of forfeitures					26,300
Distributions under employee plans					(3,708)	(478)				2,566
Net income	109,414					110,122
Dividends declared, Common						(12,572)
Dividends declared, Preferred						(4,844)
Unrealized gains on securities, net of tax	16,344	[2],[3]							16,344
Unrealized gains/(losses) on cash flow hedging activities, net of tax									(477)
Foreign currency translation adjustment, net of tax	(4,106)								(4,106)
Other					14	(709)
Distributions to non-controlling interest holders												(971)
Deconsolidation of non-controlling interest												708
Balance, end of period at Sep. 30, 2019	3,557,748		310,000	11,166	1,889,815	1,603,826			(23,594)	(289,498)	3,501,715	56,033
Balance, beginning of period at Dec. 31, 2019	3,669,790		310,000	11,166	1,909,286	1,715,704	$ (7,772)		(11,705)	(319,660)		54,999
Common stock repurchased	(56,500)									(56,517)
Unit amortization, net of forfeitures					88,717
Distributions under employee plans					(113,389)	(47,813)				60,895
Net income	315,003					315,003
Dividends declared, Common						(42,980)
Dividends declared, Preferred						(19,584)
Issuance of preferred stock			225,000		(7,005)
Dividends declared to equity-award holders					350
Unrealized gains on securities, net of tax	22,467	[2],[3]							22,467
Unrealized gains/(losses) on cash flow hedging activities, net of tax									(651)
Foreign currency translation adjustment, net of tax	(2,032)								(2,032)
Other					83	1,124
Deconsolidation of non-controlling interest												$ (54,999)
Balance, end of period at Sep. 30, 2020	4,030,687		535,000	11,166	1,878,042	1,913,682			8,079	(315,282)	4,030,687
Balance, beginning of period at Jun. 30, 2020			535,000	11,166	1,853,191	1,818,335			(16,022)	(317,610)
Unit amortization, net of forfeitures					28,101
Distributions under employee plans					(3,403)	(302)				2,328
Net income	120,527					120,527
Dividends declared, Common						(14,042)
Dividends declared, Preferred						(9,897)
Issuance of preferred stock					15
Unrealized gains on securities, net of tax	19,123	[2],[3]							19,123
Unrealized gains/(losses) on cash flow hedging activities, net of tax									(2,968)
Foreign currency translation adjustment, net of tax	7,946								7,946
Other					138	(939)
Balance, end of period at Sep. 30, 2020	$ 4,030,687		$ 535,000	$ 11,166	$ 1,878,042	$ 1,913,682			$ 8,079	$ (315,282)	$ 4,030,687

[1] Cumulative adjustments for accounting changes relate to the adoption of certain accounting updates during 2020 and 2019. See Note 2 to the consolidated financial statements for further information.

[2] As part of the adoption of ASU 2019-04, in the third quarter of 2019, the Company made a one-time election to transfer a portion of its held-to-maturity securities to available-for-sale. The transfer resulted in a net of tax increase to accumulated other comprehensive income of $17.9 million.

[3] There were no reclassifications to earnings for the three months ended September 30, 2020. Net of reclassifications to earnings of realized losses of $0.3 million for the nine months ended September 30, 2020. Reclassifications to earnings during the three months ended September 30, 2019 were immaterial. Net of reclassifications to earnings of realized losses of $0.2 million for the nine months ended September 30, 2019.