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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total net revenues [1] $ 4,737,088 $ 3,752,061 $ 3,337,030
United States [Member]      
Segment Reporting Information [Line Items]      
Total net revenues 4,332,743 3,460,930 3,154,285
United Kingdom [Member]      
Segment Reporting Information [Line Items]      
Total net revenues 239,559 197,859 163,552
Canada [Member]      
Segment Reporting Information [Line Items]      
Total net revenues 109,285 39,893 2,115
Other [Member]      
Segment Reporting Information [Line Items]      
Total net revenues $ 55,501 $ 53,379 $ 17,078
[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2021, 2020, and 2019.