Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total net revenues	[1]	$ 4,970,320	$ 4,348,944	$ 4,391,439
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues		4,705,379	4,095,476	4,125,563
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues		158,810	152,125	192,985
Canada [Member]
Segment Reporting Information [Line Items]
Total net revenues		40,536	40,034	29,268
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues		$ 65,595	$ 61,309	$ 43,623

[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2024, 2023, and 2022.