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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 84,159 | $ 97,147
Fair Value | 86,248 | 97,304
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 65,205 | 80,794
Fair Value | 64,420 | 77,433
Equity securities |  |
Investment Securities - fair value |  |
Cost | 18,954 | 16,353
Fair Value | $ 21,828 | $ 19,871

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