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INVESTMENTS - Other Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Other Investments [Line Items]      
Fair value $ 770,923 $ 787,787  
Percentage of total fair value 100.00% 100.00%  
Unfunded commitments related to other investments $ 588,000 $ 507,000  
Long/short equity funds      
Other Investments [Line Items]      
Fair value $ 31,248 $ 26,779  
Percentage of total fair value 4.00% 3.00%  
Redemption notice period 60 days 60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Fair value $ 136,542 $ 167,819  
Percentage of total fair value 18.00% 22.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 24,000 $ 84,000  
Investment term 2 years    
Multi-strategy funds | Minimum      
Other Investments [Line Items]      
Redemption notice period 60 days 45 days  
Multi-strategy funds | Maximum      
Other Investments [Line Items]      
Redemption notice period 90 days 95 days  
Direct lending funds      
Other Investments [Line Items]      
Fair value $ 277,395 $ 274,478  
Percentage of total fair value 36.00% 35.00%  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 170,000 $ 210,000  
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 10 years    
Private equity funds      
Other Investments [Line Items]      
Fair value $ 80,412 $ 64,566  
Percentage of total fair value 10.00% 8.00%  
Private equity funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 261,000 $ 16,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Fair value $ 130,112 $ 84,202  
Percentage of total fair value 17.00% 11.00%  
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 82,000 $ 147,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 7 years    
CLO-Equities      
Other Investments [Line Items]      
Fair value $ 14,328 $ 21,271  
Percentage of total fair value 2.00% 2.00%  
Other privately held investments      
Other Investments [Line Items]      
Fair value $ 36,934 $ 44,518  
Percentage of total fair value 5.00% 6.00%  
Overseas deposits      
Other Investments [Line Items]      
Fair value $ 63,952 $ 104,154  
Percentage of total fair value 8.00% 13.00%  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 69,000 $ 27,000  
Percentage of fair value of other investments subject to redemption restrictions 41.00% 14.00%  
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