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INVESTMENTS (Other Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Other Investments [Line Items]      
Other investments, at fair value $ 797,808 $ 770,923  
Percentage of total fair value 100.00% 100.00%  
Long/short equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 22,281 $ 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]      
Other investments, at fair value $ 140,096 $ 136,542  
Percentage of total fair value 18.00% 18.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 20,000 $ 24,000  
Optional extension of 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   90 days 90 days  
Direct lending funds      
Other Investments [Line Items]      
Other investments, at fair value $ 289,952 $ 277,395  
Percentage of total fair value 36.00% 36.00%  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 157,000 $ 170,000  
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 $ 83,693 $ 80,412  
Percentage of total fair value 10.00% 10.00%  
Unfunded commitments related to other investments $ 187,000 $ 261,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Other investments, at fair value $ 157,039 $ 130,112  
Percentage of total fair value 20.00% 17.00%  
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 162,000 $ 82,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 7 years    
CLO-Equities      
Other Investments [Line Items]      
Other investments, at fair value $ 12,793 $ 14,328  
Percentage of total fair value 1.00% 2.00%  
Other privately held investments      
Other Investments [Line Items]      
Other investments, at fair value $ 37,441 $ 36,934  
Percentage of total fair value 5.00% 5.00%  
Overseas deposits      
Other Investments [Line Items]      
Other investments, at fair value $ 54,513 $ 63,952  
Percentage of total fair value 7.00% 8.00%  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 67,000 $ 69,000  
Percentage of fair value of other investments subject to redemption restrictions 42.00% 41.00%  
Bank Revolver Opportunity Funds      
Other Investments [Line Items]      
Unfunded commitments related to other investments     $ 50,000
Investment term 7 years