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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 21,017 | $ 63,703
Fair Value | 23,651 | 59,271
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 10,991 | 43,507
Fair Value | 12,366 | 40,191
Equity securities |  |
Investment Securities - fair value |  |
Cost | 9,982 | 16,380
Fair Value | 11,257 | 16,981
Debt securities |  |
Investment Securities - fair value |  |
Cost | 44 | 3,816
Fair Value | $ 28 | $ 2,099

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