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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 ($)
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 958,188,000 $ 725,803,000
Unfunded Commitments 1,210,325,000 1,327,137,000
Private credit funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 677,499,000 473,112,000
Unfunded Commitments 764,384,000 868,571,000
Private equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 280,689,000 241,297,000
Unfunded Commitments 445,941,000 458,566,000
Hedge funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 0 11,394,000
Unfunded Commitments   $ 0