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FAIR VALUE MEASUREMENTS - Schedule of Other Investments Measured Using Net Asset Valuations (Details) - Fair Value Measured at Net Asset Value Per Share - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 2,540,849 | $ 2,128,499
Unfunded Commitments | 2,168,974 | 1,948,933
Private credit funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 1,295,385 | 1,181,146
Unfunded Commitments | 1,438,925 | 1,284,699
Private equity funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 689,750 | 609,105
Unfunded Commitments | 680,049 | 664,234
Hedge funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 404,735 | 338,248
Unfunded Commitments | 50,000 | $ 0
Insurance-linked securities funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 150,979 |
Unfunded Commitments | $ 0 |

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