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Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable securities: |  |
Cost | $ 59,258 | $ 63,986
Unrealized Loss | (1,409) | (1,598)
Unrealized Gain | 4,481 | 4,036
Fair Value | 62,330 | 66,424
Sponsored funds |  |
Marketable securities: |  |
Cost | 39,568 | 47,084
Unrealized Loss | (983) | (1,294)
Unrealized Gain | 1,366 | 1,059
Fair Value | 39,951 | 46,849
Fair Value | 39,951 | 46,849
Equity securities |  |
Marketable securities: |  |
Cost | 15,903 | 13,141
Unrealized Loss | (9) | (2)
Unrealized Gain | 2,747 | 2,671
Fair Value | 18,641 | 15,810
Fair Value | 18,641 | 15,810
Sponsored closed-end funds |  |
Marketable securities: |  |
Cost | 3,787 | 3,761
Unrealized Loss | (417) | (302)
Unrealized Gain | 368 | 306
Fair Value | 3,738 | 3,765
Fair Value | $ 3,738 | $ 3,765

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