Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,255,469	$ 1,163,038
Compensation and benefits		732,220	679,695
Non-compensation operating expenses		459,885	264,652
Income from operations before income tax expense		63,364	218,691
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues		850,559	790,500
Compensation and benefits		422,293	389,536
Non-compensation operating expenses		301,861	110,216
Income from operations before income tax expense		126,405	290,748
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues		384,929	351,376
Compensation and benefits		252,585	215,749
Non-compensation operating expenses		104,913	98,518
Income from operations before income tax expense		27,431	37,109
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues		19,981	21,162
Compensation and benefits		57,342	74,410
Non-compensation operating expenses		53,111	55,918
Income from operations before income tax expense		$ (90,472)	$ (109,166)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2025 and 2024.