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INVESTMENTS (Other Investments) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
fund
Dec. 31, 2020
USD ($)
Dec. 31, 2015
USD ($)
Other Investments [Line Items]      
Other investments, at fair value $ 892,664 $ 829,156  
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 $ 3,762 $ 25,300  
Percentage of total fair value (as a percent) 0.00% 3.00%  
Redemption notice period 60 days 60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Other investments, at fair value $ 67,628 $ 121,420  
Percentage of total fair value (as a percent) 8.00% 15.00%  
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 95 days  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 21,000 $ 20,000  
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 $ 297,047 $ 272,131  
Percentage of total fair value (as a percent) 33.00% 33.00%  
Redemption notice period 90 days 90 days  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 237,000 $ 151,000  
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 $ 45,000 38,000  
Number of funds | fund 1    
Private equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 226,745 $ 124,706  
Percentage of total fair value (as a percent) 25.00% 15.00%  
Private equity funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 170,000 $ 166,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Other investments, at fair value $ 225,673 $ 164,250  
Percentage of total fair value (as a percent) 25.00% 20.00%  
Redemption notice period 45 days 45 days  
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 202,000 $ 201,000  
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 61,000  
Number of funds | fund 1    
CLO-Equities      
Other Investments [Line Items]      
Other investments, at fair value $ 6,297 $ 6,173  
Percentage of total fair value (as a percent) 2.00% 1.00%  
Other privately held investments      
Other Investments [Line Items]      
Other investments, at fair value $ 65,512 $ 70,011  
Percentage of total fair value (as a percent) 7.00% 8.00%  
Overseas deposits      
Other Investments [Line Items]      
Other investments, at fair value $ 0 $ 45,165  
Percentage of total fair value (as a percent) 0.00% 5.00%  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 4,000 $ 25,000  
Percentage of fair value of other investments subject to redemption restrictions (as a percent) 5.00% 17.00%  
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