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Fair Value Measurement (Investments in LLCs and Limited Partnerships) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) fund | Dec. 31, 2023 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 246,143 | $ 245,455
Private debt funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Number of limited partners in investment | fund | 2 |
Number of limited partners to allow redemption by special consent | fund | 1 |
Private debt funds | Minimum |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Liquidating investments remaining period | 3 years |
Private debt funds | Maximum |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Liquidating investments remaining period | 8 years |
Private debt funds | Investment in unconsolidated subsidiaries |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Contractual Commitments | $ 4,565 |
Fair Value | $ 16,768 | 19,886
Long/short equity funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Number of limited partners in investment | fund | 1 |
Payment period for redemption of LP valued at NAV | 30 days |
Long/short equity funds | Investment in unconsolidated subsidiaries |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Contractual Commitments | $ 0 |
Fair Value | $ 4,243 | 4,497
Non-public equity funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Number of limited partners in investment | fund | 2 |
Liquidating investments remaining period | 10 years |
Non-public equity funds | Investment in unconsolidated subsidiaries |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Contractual Commitments | $ 38,970 |
Fair Value | $ 115,421 | 111,251
Credit funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Number of limited partners in investment | fund | 2 |
Number of limited partners to allow redemption by special consent | fund | 1 |
Investment redemption notice period | 180 days |
Number of limited partners to allow redemption by special consent of partner | fund | 2 |
Credit funds | Investment in unconsolidated subsidiaries |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Contractual Commitments | $ 31,552 |
Fair Value | $ 56,595 | 55,740
Strategy focused funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Number of limited partners not permitted for redemption | fund | 3 |
Number of limited partners, redemption allowed with prior notice | fund | 2 |
Strategy focused funds | Investment in unconsolidated subsidiaries |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Contractual Commitments | $ 50,427 |
Fair Value | $ 53,116 | $ 54,081

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