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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 2,562,953 | $ 2,128,499
Unfunded Commitments | 2,111,153 | 1,948,933
Private credit funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 1,337,818 | 1,181,146
Unfunded Commitments | 1,433,962 | 1,284,699
Private equity funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 702,066 | 609,105
Unfunded Commitments | 677,191 | 664,234
Hedge funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 379,615 | 338,248
Unfunded Commitments | 0 | $ 0
Insurance-linked securities funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 143,454 |
Unfunded Commitments | $ 0 |

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