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INVESTMENTS - Other Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Investments [Line Items]      
Fair value $ 787,787 $ 1,009,373  
Percentage of total fair value 100.00% 100.00%  
Unfunded commitments related to other investments $ 507,000 $ 414,000  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 27,000 $ 38,000  
Percentage of fair value of other investments subject to redemption restrictions 14.00% 11.00%  
Long/short equity funds      
Other Investments [Line Items]      
Fair value $ 26,779 $ 38,470  
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 $ 153,883 $ 286,164  
Percentage of total fair value 20.00% 28.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 84,000 $ 16,000  
Investment term 2 years    
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 95 days 95 days  
Event-driven funds      
Other Investments [Line Items]      
Fair value $ 13,936 $ 39,177  
Percentage of total fair value 2.00% 4.00%  
Redemption notice period 45 days 45 days  
Direct lending funds      
Other Investments [Line Items]      
Fair value $ 274,478 $ 250,681  
Percentage of total fair value 35.00% 25.00%  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 210,000 $ 137,000  
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 $ 64,566 $ 68,812  
Percentage of total fair value 8.00% 7.00%  
Unfunded commitments related to other investments $ 16,000 $ 21,000  
Investment term 10 years    
Real estate funds      
Other Investments [Line Items]      
Fair value $ 84,202 $ 50,009  
Percentage of total fair value 11.00% 5.00%  
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 147,000 $ 115,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 7 years    
CLO-Equities      
Other Investments [Line Items]      
Fair value $ 21,271 $ 31,413  
Percentage of total fair value 2.00% 2.00%  
Other privately held investments      
Other Investments [Line Items]      
Fair value $ 44,518 $ 46,430  
Percentage of total fair value 6.00% 5.00%  
Overseas deposits      
Other Investments [Line Items]      
Fair value $ 104,154 $ 198,217  
Percentage of total fair value 13.00% 20.00%  
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