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INVESTMENTS - Other Investments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
fund
Dec. 31, 2019
USD ($)
Dec. 31, 2015
USD ($)
Other Investments [Line Items]      
Fair value $ 829,156 $ 770,923  
Unfunded commitments related to other investments 588,000 588,000  
Long/short equity funds      
Other Investments [Line Items]      
Fair value $ 25,300 $ 31,248  
Percentage of total fair value 3.00% 4.00%  
Redemption notice period 60 days 60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Fair value $ 121,420 $ 136,542  
Percentage of total fair value 15.00% 18.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 20,000 $ 24,000  
Investment term 2 years    
Multi-strategy funds | Maximum      
Other Investments [Line Items]      
Redemption notice period 95 days 90 days  
Multi-strategy funds | Minimum      
Other Investments [Line Items]      
Redemption notice period 60 days 60 days  
Direct lending funds      
Other Investments [Line Items]      
Fair value $ 272,131 $ 277,395  
Percentage of total fair value 33.00% 36.00%  
Redemption notice period 90 days    
Direct lending funds | Quarterly Redemption      
Other Investments [Line Items]      
Fair value $ 38,000    
Number of funds | fund 1    
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 151,000 $ 170,000  
Optional extension of investment term 3 years    
Direct lending funds | Maximum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 15 years    
Direct lending funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 5 years    
Private equity funds      
Other Investments [Line Items]      
Fair value $ 124,706 $ 80,412  
Percentage of total fair value 15.00% 10.00%  
Private equity funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 166,000 $ 261,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Fair value $ 164,250 $ 130,112  
Percentage of total fair value 20.00% 17.00%  
Redemption notice period 45 days    
Real estate funds | Quarterly Redemption      
Other Investments [Line Items]      
Fair value $ 61,000    
Number of funds | fund 1    
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 201,000 $ 82,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 7 years    
CLO-Equities      
Other Investments [Line Items]      
Fair value $ 6,173 $ 14,328  
Percentage of total fair value 1.00% 2.00%  
Other privately held investments      
Other Investments [Line Items]      
Fair value $ 70,011 $ 36,934  
Percentage of total fair value 8.00% 5.00%  
Overseas deposits      
Other Investments [Line Items]      
Fair value $ 45,165 $ 63,952  
Percentage of total fair value 5.00% 8.00%  
Total other investments      
Other Investments [Line Items]      
Fair value $ 829,156 $ 770,923  
Percentage of total fair value 100.00% 100.00%  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 25,000 $ 69,000  
Percentage of fair value of other investments subject to redemption restrictions 17.00% 41.00%  
Bank Revolver Opportunity Funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments     $ 50,000
Investment term 7 years    
Optional extension of investment term 2 years