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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 83,506 | $ 80,912
Fair Value | 80,654 | 76,999
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 69,995 | 67,472
Fair Value | 65,551 | 62,744
Equity securities |  |
Investment Securities - fair value |  |
Cost | 13,511 | 13,440
Fair Value | $ 15,103 | $ 14,255

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