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INVESTMENTS - Other Investments (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
fund
Dec. 31, 2021
USD ($)
Dec. 31, 2015
USD ($)
Other Investments [Line Items]      
Other investments, at fair value $ 970,310 $ 947,982  
Percentage of total fair value (as a percent) 100.00% 100.00%  
Long/short equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 0 $ 3,476  
Percentage of total fair value (as a percent) 0.00% 0.00%  
Redemption notice period   60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Other investments, at fair value $ 39,138 $ 56,012  
Percentage of total fair value (as a percent) 4.00% 6.00%  
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  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 26,000 $ 23,000  
Multi-strategy funds | Other Redemption Restriction | Minimum      
Other Investments [Line Items]      
Investment term 2 years    
Direct lending funds      
Other Investments [Line Items]      
Other investments, at fair value $ 249,561 $ 289,867  
Percentage of total fair value (as a percent) 26.00% 31.00%  
Redemption notice period 90 days 90 days  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 192,000 $ 224,000  
Optional extension of investment term 3 years    
Direct lending funds | Other Redemption Restriction | Minimum      
Other Investments [Line Items]      
Investment term 4 years    
Direct lending funds | Other Redemption Restriction | Maximum      
Other Investments [Line Items]      
Investment term 10 years    
Direct lending funds | Quarterly Redemption      
Other Investments [Line Items]      
Other investments, at fair value $ 43,000 47,000  
Number of funds | fund 1    
Private equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 268,593 $ 249,974  
Percentage of total fair value (as a percent) 28.00% 26.00%  
Private equity funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 167,000 $ 178,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Other investments, at fair value $ 287,932 $ 238,222  
Percentage of total fair value (as a percent) 30.00% 25.00%  
Redemption notice period   45 days  
Real estate funds | Minimum      
Other Investments [Line Items]      
Redemption notice period 45 days    
Real estate funds | Maximum      
Other Investments [Line Items]      
Redemption notice period 90 days    
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 147,000 $ 173,000  
Real estate funds | Other Redemption Restriction | Minimum      
Other Investments [Line Items]      
Investment term 2 years    
Real estate funds | Quarterly Redemption      
Other Investments [Line Items]      
Other investments, at fair value $ 73,000 73,000  
Number of funds | fund 1    
Real estate funds | Annual Redemption      
Other Investments [Line Items]      
Other investments, at fair value $ 26,000 0  
Number of funds | fund 1    
CLO-Equities      
Other Investments [Line Items]      
Other investments, at fair value $ 5,167 $ 5,910  
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 $ 119,919 $ 104,521  
Percentage of total fair value (as a percent) 12.00% 11.00%  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 0 $ 3,000  
Bank Revolver Opportunity Funds      
Other Investments [Line Items]      
Unfunded commitments related to other investments     $ 50,000
Investment term 7 years    
Optional extension of investment term 2 years