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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total net revenues	[1]	$ 1,429,396	$ 1,224,668	$ 3,969,151	$ 3,605,638
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues		1,349,681	1,167,463	3,753,964	3,415,635
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues		48,260	32,945	138,838	113,168
Canada [Member]
Segment Reporting Information [Line Items]
Total net revenues		15,079	9,309	40,649	31,539
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues		$ 16,376	$ 14,951	$ 35,700	$ 45,296
[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2025 and 2024.

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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