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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Investment Holdings [Line Items] |
Fair Value | $ 5,816
Unfunded Commitments | 1,399
Hedge Funds [Member] |
Investment Holdings [Line Items] |
Fair Value | 1,589
Unfunded Commitments | $ 0
Redemption Frequency | Quarterly - Annually
Private Equity Funds |
Investment Holdings [Line Items] |
Fair Value | $ 4,227
Unfunded Commitments | $ 1,399

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