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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 63,703 |
Fair Value | 59,271 |
Cost |  | $ 67,802
Fair Value |  | 69,101
Sponsored funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 43,507 |
Fair Value | 40,191 |
Cost |  | 50,845
Fair Value |  | 50,614
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 16,380 |
Fair Value | 16,981 |
Cost |  | 13,141
Fair Value |  | 15,810
Trading debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 3,816 |
Fair Value | $ 2,099 |
Cost |  | 3,816
Fair Value |  | $ 2,677

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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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