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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 55,882 | $ 63,703
Fair Value | 60,990 | 59,271
Sponsored funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 44,588 | 43,507
Fair Value | 47,654 | 40,191
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 11,250 | 16,380
Fair Value | 13,320 | 16,981
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 44 | 3,816
Fair Value | $ 16 | $ 2,099

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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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