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INVESTMENTS - Other Investments (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
fund
Dec. 31, 2022
USD ($)
Other Investments [Line Items]    
Other investments, at fair value $ 954,571 $ 996,751
Percentage of total fair value (as a percent) 100.00% 100.00%
Limited partnership    
Other Investments [Line Items]    
Percentage of investment composition (as a percent) 75.00%  
Multi-strategy funds    
Other Investments [Line Items]    
Other investments, at fair value $ 25,465 $ 32,616
Percentage of total fair value (as a percent) 3.00% 3.00%
Multi-strategy funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 28,000 $ 26,000
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 $ 229,235 $ 258,626
Percentage of total fair value (as a percent) 24.00% 26.00%
Redemption notice period 90 days 90 days
Direct lending funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 191,000 $ 183,000
Optional extension of investment term 3 years  
Direct lending funds | Quarterly Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 22,000 39,000
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 $ 283,838 $ 265,836
Percentage of total fair value (as a percent) 30.00% 27.00%
Private equity funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 153,000 $ 158,000
Investment term 6 years  
Real estate funds    
Other Investments [Line Items]    
Other investments, at fair value $ 307,177 $ 298,499
Percentage of total fair value (as a percent) 32.00% 30.00%
Real estate funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 119,000 $ 141,000
Real estate funds | Quarterly Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 67,000 73,000
Number of funds | fund 1  
Real estate funds | Annual Redemption    
Other Investments [Line Items]    
Other investments, at fair value $ 24,000 $ 27,000
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 $ 4,684 $ 5,016
Percentage of total fair value (as a percent) 0.00% 0.00%
Other privately held investments    
Other Investments [Line Items]    
Other investments, at fair value $ 104,172 $ 136,158
Percentage of total fair value (as a percent) 11.00% 14.00%
Hedge funds | Lockup Redemption Restriction    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions $ 0 $ 0
Venture capital funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 15,000 $ 16,000
Investment term 5 years  
Number of funds | fund 2