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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 122,324 | $ 80,912
Fair Value | 118,464 | 76,999
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 82,156 | 67,472
Fair Value | 76,958 | 62,744
Equity securities |  |
Investment Securities - fair value |  |
Cost | 15,829 | 13,440
Fair Value | 17,167 | 14,255
Debt securities |  |
Investment Securities - fair value |  |
Cost | 24,339 | 0
Fair Value | $ 24,339 | $ 0

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