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]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock at Cost [Member]	Non-controlling Interests [Member]	Parent [Member]
Balance, beginning of year at Dec. 31, 2016				$ 150,000	$ 10,426	$ 1,840,551	$ 876,958	$ (39,042)	$ (100,485)
Common stock issued under employee plans					292	(288,152)			74,175
Common stock repurchased									(12,998)
Common stock issued for acquisitions					28	9,324
Unit amortization, net of forfeitures						167,908
Net income		$ 182,871					182,871
Dividends declared, Common							(17,446)
Dividends declared, Preferred							(9,375)
Dividends declared to equity-award holders						3,758
Other						(41)	518
Unrealized gains/(losses) on securities, net of tax		4,730	[1],[2],[3],[4]					4,730
Unrealized losses on cash flow hedging activities, net of tax								(320)
Foreign currency translation adjustment, net of tax		7,896	[3],[4]					7,896
Balance, end of year at Dec. 31, 2017		2,861,576		150,000	10,746	1,733,348	1,033,526	(26,736)	(39,308)		$ 2,861,576
Common stock issued under employee plans					123	(60,256)	(10,985)		28,655
Common stock repurchased		(170,200)							(170,204)
Common stock issued for acquisitions					297	110,374
Unit amortization, net of forfeitures						102,971
Net income		393,968					393,968
Dividends declared, Common							(41,450)
Dividends declared, Preferred							(9,375)
Dividends declared to equity-award holders						6,812
Other						55	1,943
Unrealized gains/(losses) on securities, net of tax		(36,254)	[1],[2],[3],[4]					(36,254)
Unrealized losses on cash flow hedging activities, net of tax								(792)
Foreign currency translation adjustment, net of tax		(5,691)	[3],[4]					(5,691)
Cumulative adjustments for accounting changes	[5]						(1,124)	(3,050)
Capital contributions from non-controlling interest holders										$ 30,000
Balance, end of year at Dec. 31, 2018		3,197,593		150,000	11,166	1,893,304	1,366,503	(72,523)	(180,857)	30,000	3,167,593
Common stock issued under employee plans						(91,898)	(19,819)		76,627
Common stock repurchased		(215,400)							(215,430)
Unit amortization, net of forfeitures						112,864
Net income		448,396					449,986			1,590
Dividends declared, Common							(50,743)
Dividends declared, Preferred							(17,319)
Issuance of preferred stock				160,000		(5,012)
Other						28	(1,787)
Unrealized gains/(losses) on securities, net of tax		60,288	[1],[2],[3],[4]					60,288
Unrealized losses on cash flow hedging activities, net of tax								(4,402)
Foreign currency translation adjustment, net of tax		4,932	[3],[4]					4,932
Cumulative adjustments for accounting changes	[5]						(11,117)
Capital contributions from non-controlling interest holders										26,800
Distributions to non-controlling interest holders										(3,391)
Balance, end of year at Dec. 31, 2019		$ 3,669,790		$ 310,000	$ 11,166	$ 1,909,286	$ 1,715,704	$ (11,705)	$ (319,660)	$ 54,999	$ 3,614,791

[1] Amounts are net of reclassifications to earnings of realized losses of $0.2 million and $2.9 million and realized gains of $0.2 million for the years ended December 31, 2019, 2018, and 2017, respectively.

[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. See Notes 2 and 7 for additional information on the transfer.

[3] Net of a tax expense of $20.2 million, tax benefit of $11.2 million, and tax expense of $3.3 million for the years ended December 31, 2019, 2018, and 2017, respectively.

[4] The adoption of ASU 2018-02 on January 1, 2018, resulted in a reclassification of $3.1 million to retained earnings related to cash flow hedges and investment portfolio risk. The reclassification is reflected in the activity for the year ended December 31, 2018. See Note 2 for further details.

[5] Cumulative adjustments for accounting changes relate to the adoption of certain accounting updates. See Note 2 of the Notes to Consolidated Financial Statements for additional information.