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Marketable Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |  |  |
Cash equivalents at fair value | $ 633,780 |  | $ 633,780 |  | $ 565,588
Net unrealized gains (loss) | (5,580) |  | (5,580) |  | (6,875)
Net unrealized gains (losses) income tax expense (benefit) | (1,667) |  | (1,667) |  | (2,054)
Mutual funds and equities, gross realized gains |  |  | 1,651 |  |
Mutual funds and equities, gross realized loss |  |  | 1,416 |  |
Other long-term investments | 49,675 |  | 49,675 |  | 110,781
Securities owned | 30,289 |  | 30,289 |  | 31,334
Investment Funds Sponsored by LSV |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Other long-term investments | 8,410 |  | 8,410 |  | $ 7,316
Unrealized gains (losses) on investments | $ 673 | $ 66 | $ 1,094 | $ 472 |

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