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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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- Definition

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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