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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Investment Holdings [Line Items] |  |
Fair Value | $ 7,441 | $ 7,441
Unfunded Commitments | 1,251 | 1,251
Hedge Funds [Member] |  |
Investment Holdings [Line Items] |  |
Fair Value | 2,783 | 2,783
Unfunded Commitments | 0 | $ 0
Redemption Frequency |  | Quarterly - Annually
Investment Redemption Notice Period Minimum |  | 30 days
Investment Redemption Notice Period Maximum |  | 120 days
Private Equity Funds [Member] |  |
Investment Holdings [Line Items] |  |
Fair Value | 4,658 | $ 4,658
Unfunded Commitments | $ 1,251 | $ 1,251
Investments Lock In Period | 10 years |
Maximum [Member] | Hedge Funds [Member] |  |
Investment Holdings [Line Items] |  |
Investments Lock In Period | 1 year |

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