v3.26.3
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, 2026
Dec. 31, 2025
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 3,267,118 $ 2,775,499
Unfunded Commitments 2,926,932 2,266,285
Private credit funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 1,597,821 1,445,158
Unfunded Commitments 2,224,853 1,605,126
Private equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 788,907 701,837
Unfunded Commitments 702,079 661,159
Multi-strategy funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 633,225 473,990
Unfunded Commitments 0 0
Insurance-linked securities funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 167,984 154,514
Unfunded Commitments 0 0
Equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 79,181 0
Unfunded Commitments $ 0 $ 0