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Marketable Securities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]          
Cash equivalents at fair value $ 519,897   $ 519,897   $ 565,588
Net unrealized gains (loss) (8,883)   (8,883)   (6,875)
Net unrealized gains (losses) income tax expense (benefit) (2,653)   (2,653)   (2,054)
Mutual funds and equities, gross realized gains     1,182    
Mutual funds and equities, gross realized loss     133    
Other long-term investments 53,223   53,223   110,781
Securities owned 30,338   30,338   31,334
Investment Funds Sponsored by LSV          
Schedule of Investments [Line Items]          
Other long-term investments 7,737   7,737   $ 7,316
Unrealized gains (losses) on investments $ (412) $ 235 $ 421 $ 406