Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 725,647	$ 652,145	$ 1,401,178	$ 1,272,119
Income/(loss) before income taxes		83,198	15,793	162,217	59,706
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	451,990	386,039	894,722	765,843
Income/(loss) before income taxes		153,237	105,053	295,289	198,387
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	276,153	260,920	513,620	502,196
Income/(loss) before income taxes		52,892	42,414	92,764	71,705
Other [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(2,496)	5,186	(7,164)	4,080
Income/(loss) before income taxes		$ (122,931)	$ (131,674)	$ (225,836)	$ (210,386)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2017 or 2016.