Consolidated Statements Of Shareholders' Equity (Unaudited) - 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]	Parent [Member]	Non-controlling Interests [Member]
Balance, beginning of period at Dec. 31, 2017				$ 150,000	$ 10,746	$ 1,733,348	$ 1,033,526	$ (26,736)	$ (39,308)
Common stock issued under employee plans					123				20,073
Common stock repurchased		$ (45,900)							(45,883)
Unit amortization, net of forfeitures						49,598
Net income		176,048					176,048
Dividends declared, Common							(20,573)
Dividends declared, Preferred							(4,688)
Common stock issued under employee plans and related tax benefits						(49,406)	(9,110)
Other						(37)	1,072
Dividends declared to equity-award holders						3,350
Unrealized gains/(losses) on securities, net of tax								(24,927)
Unrealized gains/(losses) on cash flow hedging activities, net of tax								3,418
Foreign currency translation adjustment, net of tax		(2,098)	[1],[2]					(2,098)
Cumulative adjustments for accounting changes	[3]						(1,124)	(3,050)
Balance, end of period at Jun. 30, 2018		2,954,362		150,000	10,869	1,736,853	1,175,151	(53,393)	(65,118)	$ 2,954,362
Balance, beginning of period at Mar. 31, 2018				149,968	10,869	1,719,710	1,103,013	(36,415)	(29,605)
Common stock issued under employee plans									7,531
Common stock repurchased		(43,000)							(43,044)
Unit amortization, net of forfeitures						21,444
Net income		87,287					87,287
Dividends declared, Common							(11,944)
Dividends declared, Preferred							(2,344)
Common stock issued under employee plans and related tax benefits						(6,015)	(1,146)
Issuance of common stock for acquisitions						56
Other				32		(41)	285
Dividends declared to equity-award holders						1,699
Unrealized gains/(losses) on securities, net of tax								(11,856)
Unrealized gains/(losses) on cash flow hedging activities, net of tax								712
Foreign currency translation adjustment, net of tax		(5,834)	[1],[2]					(5,834)
Balance, end of period at Jun. 30, 2018		2,954,362		150,000	10,869	1,736,853	1,175,151	(53,393)	(65,118)	2,954,362
Balance, beginning of period at Dec. 31, 2018		3,197,593		150,000	11,166	1,893,304	1,366,503	(72,523)	(180,857)		$ 30,000
Common stock issued under employee plans									69,227
Common stock repurchased		(125,000)							(124,966)
Unit amortization, net of forfeitures						60,088
Net income		208,292					209,196				904
Dividends declared, Common							(25,677)
Dividends declared, Preferred							(7,632)
Common stock issued under employee plans and related tax benefits						(81,194)	(18,292)
Issuance of preferred stock				160,000		(5,012)
Other						23	(587)
Unrealized gains/(losses) on securities, net of tax								42,084
Unrealized gains/(losses) on cash flow hedging activities, net of tax								(3,783)
Foreign currency translation adjustment, net of tax		(1,133)	[1],[2]					(1,133)
Cumulative adjustments for accounting changes	[3]						(10,809)
Capital contributions from non-controlling interest holders											26,800
Distributions to non-controlling interest holders											(1,408)
Balance, end of period at Jun. 30, 2019		3,485,422		310,000	11,166	1,867,209	1,512,702	(35,355)	(236,596)	3,429,126	56,296
Balance, beginning of period at Mar. 31, 2019				310,000	11,166	1,826,604	1,443,658	(46,381)	(168,424)		56,574
Common stock issued under employee plans									2,925
Common stock repurchased		(71,100)							(71,097)
Unit amortization, net of forfeitures						26,771
Net income		109,085					109,757				672
Dividends declared, Common							(12,733)
Dividends declared, Preferred							(5,288)
Common stock issued under employee plans and related tax benefits						14,101	(18,319)
Issuance of preferred stock						(306)
Other						39	(323)
Unrealized gains/(losses) on securities, net of tax								16,284
Unrealized gains/(losses) on cash flow hedging activities, net of tax								(1,957)
Foreign currency translation adjustment, net of tax		(3,301)	[1],[2]					(3,301)
Cumulative adjustments for accounting changes	[3]						(4,050)
Distributions to non-controlling interest holders											(950)
Balance, end of period at Jun. 30, 2019		$ 3,485,422		$ 310,000	$ 11,166	$ 1,867,209	$ 1,512,702	$ (35,355)	$ (236,596)	$ 3,429,126	$ 56,296

[1] Net of tax expense of $3.9 million and tax benefit of $6.0 million for the three months ended June 30, 2019 and 2018, respectively. Net of tax expense of $13.7 million and tax benefit of $8.3 million for the six months ended June 30, 2019 and 2018, respectively.

[2] 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

[3] ^{Cumulative adjustments for accounting changes relate to the adoption of certain accounting updates during 2019 and 2018. See Note 2 to the consolidated financial statements for further information. The 2018 adjustments are described further in Note 2 to the consolidated financial statements in our 2018 Form 10-K.}