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Marketable Securities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]      
Cash equivalents at fair value $ 598,118   $ 565,588
Net unrealized gains (loss) (8,211)   (6,875)
Net unrealized gains (losses) income tax expense (benefit) (2,452)   (2,054)
Mutual funds and equities, gross realized gains 595    
Mutual funds and equities, gross realized loss 46    
Other long-term investments 57,291   110,781
Securities owned 31,958   31,334
Investment Funds Sponsored by LSV      
Schedule of Investments [Line Items]      
Other long-term investments 8,149   $ 7,316
Unrealized gains (losses) on investments $ 833 $ (171)