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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Investment Holdings [Line Items] |  |
Fair Value | $ 5,489 | $ 5,816
Unfunded Commitments | $ 1,238 | 1,339
Hedge Funds [Member] |  |
Investment Holdings [Line Items] |  |
Investment Redemption Notice Period Minimum | 30 days |
Investment Redemption Notice Period Maximum | 120 days |
Fair Value | $ 1,138 | 1,589
Unfunded Commitments | $ 0 | $ 0
Redemption Frequency | Quarterly - Annually | Quarterly - Annually
Private Equity Funds |  |
Investment Holdings [Line Items] |  |
Fair Value | $ 4,351 | $ 4,227
Unfunded Commitments | $ 1,238 | $ 1,339

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