Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total net revenues	[1]	$ 1,255,469	$ 1,163,038
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues		1,181,460	1,101,004
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues		48,244	37,525
Canada [Member]
Segment Reporting Information [Line Items]
Total net revenues		16,479	11,620
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues		$ 9,286	$ 12,889

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