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INVESTMENTS - Other Investments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
fund
Dec. 31, 2023
USD ($)
Other Investments [Line Items]    
Asset fair value $ 930,278 $ 949,413
Percentage of total fair value 100.00% 100.00%
Unfunded commitments related to other investments $ 526,000 $ 502,000
Multi-strategy funds    
Other Investments [Line Items]    
Asset fair value $ 24,919 $ 24,619
Percentage of total fair value 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]    
Redemption notice period 2 years  
Unfunded commitments related to other investments $ 28,000 $ 28,000
Multi-strategy funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 60 days 60 days
Multi-strategy funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days 90 days
Direct lending funds    
Other Investments [Line Items]    
Asset fair value $ 171,048 $ 192,270
Percentage of total fair value 18.00% 20.00%
Redemption notice period 90 days 90 days
Direct lending funds | Quarterly Redemption    
Other Investments [Line Items]    
Asset fair value $ 3,000 $ 17,000
Number of funds | fund 1  
Direct lending funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 170,000 192,000
Optional extension of investment term 3 years  
Direct lending funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 3 years  
Direct lending funds | Maximum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 10 years  
Private equity funds    
Other Investments [Line Items]    
Asset fair value $ 320,690 $ 301,712
Percentage of total fair value 35.00% 32.00%
Private equity funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 215,000 $ 145,000
Investment term 6 years  
Real estate funds    
Other Investments [Line Items]    
Asset fair value $ 291,640 $ 317,325
Percentage of total fair value 31.00% 33.00%
Real estate funds | Quarterly Redemption    
Other Investments [Line Items]    
Asset fair value $ 51,000 $ 66,000
Number of funds | fund 1  
Real estate funds | Annually Redemption    
Other Investments [Line Items]    
Asset fair value $ 21,000 25,000
Number of funds | fund 1  
Real estate funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 91,000 $ 107,000
Investment term 2 years  
Real estate funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 45 days 45 days
Real estate funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days 90 days
CLO-Equities    
Other Investments [Line Items]    
Asset fair value $ 0 $ 5,300
Percentage of total fair value 0.00% 1.00%
Other privately held investments    
Other Investments [Line Items]    
Asset fair value $ 121,981 $ 108,187
Percentage of total fair value 13.00% 11.00%
Private company investment funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 21,000 $ 30,000
Number of investment funds | fund 3  
Private company investment funds | Other Redemption Restriction | 5-year term    
Other Investments [Line Items]    
Investment term 5 years  
Number of investment funds | fund 2  
Private company investment funds | Other Redemption Restriction | 10-year term    
Other Investments [Line Items]    
Investment term 10 years  
Number of investment funds | fund 1