Consolidated Statements Of Changes In 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				12,542
Common stock repurchased		$ (2,800)							(2,839)
Unit amortization, net of forfeitures						28,154
Net income		88,761					88,761
Dividends declared, Common							(8,629)
Dividends declared, Preferred							(2,344)
Common stock issued under employee plans and related tax benefits						(43,391)	(7,964)
Issuance of common stock for acquisitions						(56)
Dividends declared to equity-award holders						1,651
Unrealized gains/(losses) on securities, net of tax								(13,071)
Unrealized gains/(losses) on cash flow hedging activities, net of tax								2,706
Foreign currency translation adjustment, net of tax		3,736	[1],[2]					3,736
Other				(32)		4	787
Balance, end of period at Mar. 31, 2018		2,917,540		149,968	10,869	1,719,710	1,103,013	(36,415)	(29,605)	$ 2,917,540
Cumulative adjustments for accounting changes	[3]						(1,124)	(3,050)
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									66,302
Common stock repurchased		(53,900)							(53,869)
Unit amortization, net of forfeitures						33,317
Net income		99,207					99,439				232
Dividends declared, Common							(12,944)
Dividends declared, Preferred							(2,344)
Common stock issued under employee plans and related tax benefits						(95,295)	27
Issuance of preferred stock				160,000		(4,706)
Unrealized gains/(losses) on securities, net of tax								25,800
Unrealized gains/(losses) on cash flow hedging activities, net of tax								(1,826)
Foreign currency translation adjustment, net of tax		2,168	[1],[2]					2,168
Other						(16)	(264)
Capital contributions from non-controlling interest holders											26,800
Distributions to non-controlling interest holders											(458)
Balance, end of period at Mar. 31, 2019		$ 3,433,197		$ 310,000	$ 11,166	$ 1,826,604	1,443,658	$ (46,381)	$ (168,424)	$ 3,376,623	$ 56,574
Cumulative adjustments for accounting changes	[3]						$ (6,759)

[1] Net of tax expense of $10.1 million and tax benefit of $2.3 million for the three months ended March 31, 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 credit 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.