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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 97,147 | $ 80,912
Fair Value | 97,304 | 76,999
Sponsored funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 80,794 | 67,472
Fair Value | 77,433 | 62,744
Equity investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 16,353 | 13,440
Fair Value | $ 19,871 | $ 14,255

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