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INVESTMENTS - Other Investments (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
fund
Dec. 31, 2023
USD ($)
Other Investments [Line Items]    
Other investments, at fair value $ 939,734,000 $ 949,413,000
Percentage of total fair value (as a percent) 100.00% 100.00%
Multi-strategy funds    
Other Investments [Line Items]    
Other investments, at fair value $ 24,302,000 $ 24,619,000
Percentage of total fair value (as a percent) 3.00% 3.00%
Multi-strategy funds | Lockup Redemption Restriction    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions $ 0 $ 0
Multi-strategy funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 28,000,000 $ 28,000,000
Multi-strategy funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 60 days 60 days
Multi-strategy funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 2 years  
Multi-strategy funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days 90 days
Direct lending funds    
Other Investments [Line Items]    
Other investments, at fair value $ 174,441,000 $ 192,270,000
Percentage of total fair value (as a percent) 19.00% 20.00%
Redemption notice period 90 days 90 days
Direct lending funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 259,000,000 $ 192,000,000
Optional extension of investment term 3 years  
Direct lending funds | Quarterly Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 4,000,000 17,000,000
Number of funds | fund 1  
Direct lending funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 4 years  
Direct lending funds | Maximum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 10 years  
Private equity funds    
Other Investments [Line Items]    
Other investments, at fair value $ 314,444,000 $ 301,712,000
Percentage of total fair value (as a percent) 33.00% 32.00%
Private equity funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 117,000,000 $ 145,000,000
Investment term 6 years  
Real estate funds    
Other Investments [Line Items]    
Other investments, at fair value $ 310,130,000 $ 317,325,000
Percentage of total fair value (as a percent) 33.00% 33.00%
Real estate funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 95,000,000 $ 107,000,000
Real estate funds | Quarterly Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 54,000,000 66,000,000
Number of funds | fund 1  
Real estate funds | Annual Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 23,000,000 $ 25,000,000
Number of funds | fund 1  
Real estate funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 45 days 45 days
Real estate funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 2 years  
Real estate funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days 90 days
CLO-Equities    
Other Investments [Line Items]    
Other investments, at fair value $ 4,133,000 $ 5,300,000
Percentage of total fair value (as a percent) 0.00% 1.00%
Other privately held investments    
Other Investments [Line Items]    
Other investments, at fair value $ 112,284,000 $ 108,187,000
Percentage of total fair value (as a percent) 12.00% 11.00%
Private Company Investment Funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 23,000,000 $ 30,000,000
Number of funds | fund 3  
Private Company Investment Funds | Other Redemption Restriction | Investment Funds, Term, Period One    
Other Investments [Line Items]    
Investment term 5 years  
Number of funds | fund 2  
Private Company Investment Funds | Other Redemption Restriction | Investment Funds, Term, Period Two    
Other Investments [Line Items]    
Investment term 10 years  
Number of funds | fund 1