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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Total net revenues $ 944,251 $ 821,572 $ 800,787 $ 770,420 $ 793,449 $ 738,342 $ 742,732 $ 750,358 $ 3,337,030 [1] $ 3,024,881 [1] $ 2,926,432 [1]
United States [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 3,154,285 2,855,955 2,783,175
United Kingdom [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 163,552 156,557 129,288
Other [Member]                      
Segment Reporting Information [Line Items]                      
Total net revenues                 $ 19,193 $ 12,369 $ 13,969
[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2019, 2018, and 2017.