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FAIR VALUE MEASUREMENTS - Company's Portfolio of Other Investments Measured Using Net Asset Valuations (Details) - Fair Value Measured at Net Asset Value Per Share - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 1,241,347 $ 1,086,706
Unfunded Commitments 1,163,839 1,207,457
Private credit funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 876,010 771,383
Unfunded Commitments 628,000 714,302
Private equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 365,337 315,323
Unfunded Commitments $ 535,839 $ 493,155