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INVESTMENTS - Other Investments (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) fund | Dec. 31, 2023 USD ($)
Other Investments [Line Items] |  |
Other investments, at fair value | $ 936,680 | $ 949,413
Percentage of total fair value (as a percent) | 100.00% | 100.00%
Multi-strategy funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 24,634 | $ 24,619
Percentage of total fair value (as a percent) | 3.00% | 3.00%
Multi-strategy funds | Lockup Redemption Restriction |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | $ 0 | $ 0
Multi-strategy funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 28,000 | $ 28,000
Multi-strategy funds | Minimum |  |
Other Investments [Line Items] |  |
Redemption notice period | 60 days | 60 days
Multi-strategy funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 2 years |
Multi-strategy funds | Maximum |  |
Other Investments [Line Items] |  |
Redemption notice period | 90 days | 90 days
Direct lending funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 167,137 | $ 192,270
Percentage of total fair value (as a percent) | 18.00% | 20.00%
Redemption notice period | 90 days | 90 days
Direct lending funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 272,000 | $ 192,000
Optional extension of investment term | 3 years |
Direct lending funds | Quarterly Redemption |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 10,000 | 17,000
Number of funds | fund | 1 |
Direct lending funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 4 years |
Direct lending funds | Maximum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 10 years |
Private equity funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 318,608 | $ 301,712
Percentage of total fair value (as a percent) | 34.00% | 32.00%
Private equity funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 123,000 | $ 145,000
Investment term | 6 years |
Real estate funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 309,793 | $ 317,325
Percentage of total fair value (as a percent) | 33.00% | 33.00%
Real estate funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 98,000 | $ 107,000
Real estate funds | Quarterly Redemption |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 61,000 | 66,000
Number of funds | fund | 1 |
Real estate funds | Annual Redemption |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 23,000 | $ 25,000
Number of funds | fund | 1 |
Real estate funds | Minimum |  |
Other Investments [Line Items] |  |
Redemption notice period | 45 days | 45 days
Real estate funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 2 years |
Real estate funds | Maximum |  |
Other Investments [Line Items] |  |
Redemption notice period | 90 days | 90 days
CLO-Equities |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 4,498 | $ 5,300
Percentage of total fair value (as a percent) | 0.00% | 1.00%
Other privately held investments |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 112,010 | $ 108,187
Percentage of total fair value (as a percent) | 12.00% | 11.00%
Private Company Investment Funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 23,000 | $ 30,000
Number of funds | fund | 3 |
Private Company Investment Funds | Other Redemption Restriction | Investment Funds, Term, Period One |  |
Other Investments [Line Items] |  |
Investment term | 5 years |
Number of funds | fund | 2 |
Private Company Investment Funds | Other Redemption Restriction | Investment Funds, Term, Period Two |  |
Other Investments [Line Items] |  |
Investment term | 10 years |
Number of funds | fund | 1 |

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