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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Securities - fair value |  |
Cost | $ 37,097 | $ 55,882
Fair Value | 35,460 | 60,990
Sponsored funds |  |
Investment Securities - fair value |  |
Cost | 26,188 | 44,588
Fair Value | 24,825 | 47,654
Equity securities |  |
Investment Securities - fair value |  |
Cost | 10,902 | 11,250
Fair Value | 10,629 | 13,320
Debt securities |  |
Investment Securities - fair value |  |
Cost | 7 | 44
Fair Value | $ 6 | $ 16

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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