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INVESTMENTS (Other Investments) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
fund
Dec. 31, 2020
USD ($)
Dec. 31, 2015
USD ($)
Other Investments [Line Items]      
Other investments, at fair value $ 865,238 $ 829,156  
Percentage of total fair value 100.00% 100.00%  
Long/short equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 3,774 $ 25,300  
Percentage of total fair value 0.00% 3.00%  
Redemption notice period 60 days 60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Other investments, at fair value $ 108,974 $ 121,420  
Percentage of total fair value 13.00% 15.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 21,000 $ 20,000  
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 95 days 95 days  
Direct lending funds      
Other Investments [Line Items]      
Other investments, at fair value $ 288,404 $ 272,131  
Percentage of total fair value 33.00% 33.00%  
Redemption notice period 90 days 90 days  
Direct lending funds | Quarterly Redemption      
Other Investments [Line Items]      
Other investments, at fair value $ 43,000 $ 38,000  
Number of funds | fund 1    
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 248,000 151,000  
Optional extension of investment term 3 years    
Direct lending funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 5 years    
Direct lending funds | Maximum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 15 years    
Private equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 190,465 $ 124,706  
Percentage of total fair value 22.00% 15.00%  
Private equity funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 177,000 $ 166,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Other investments, at fair value $ 201,833 $ 164,250  
Percentage of total fair value 23.00% 20.00%  
Redemption notice period 45 days 45 days  
Real estate funds | Quarterly Redemption      
Other Investments [Line Items]      
Other investments, at fair value $ 74,000 $ 61,000  
Number of funds | fund 1    
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 224,000 201,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 2 years    
CLO-Equities      
Other Investments [Line Items]      
Other investments, at fair value $ 7,002 $ 6,173  
Percentage of total fair value 2.00% 1.00%  
Other privately held investments      
Other Investments [Line Items]      
Other investments, at fair value $ 64,786 $ 70,011  
Percentage of total fair value 7.00% 8.00%  
Overseas deposits      
Other Investments [Line Items]      
Other investments, at fair value $ 0 $ 45,165  
Percentage of total fair value 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 3.00% 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