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INVESTMENTS (Other Investments) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2015
Other Investments [Line Items]      
Other investments, at fair value $ 779,200 $ 787,787  
Percentage of total fair value 100.00% 100.00%  
Long/short equity funds      
Other Investments [Line Items]      
Other investments, at fair value $ 30,617 $ 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]      
Other investments, at fair value $ 166,079 $ 167,819  
Percentage of total fair value 21.00% 22.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 37,000 $ 84,000  
Multi-strategy funds | Minimum      
Other Investments [Line Items]      
Redemption notice period 60 days 45 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 90 days 95 days  
Direct lending funds      
Other Investments [Line Items]      
Other investments, at fair value $ 275,619 $ 274,478  
Percentage of total fair value 35.00% 35.00%  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 184,000 $ 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]      
Other investments, at fair value $ 67,210 $ 64,566  
Percentage of total fair value 9.00% 8.00%  
Unfunded commitments related to other investments $ 171,000 $ 16,000  
Investment term 5 years    
Real estate funds      
Other Investments [Line Items]      
Other investments, at fair value $ 130,209 $ 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 $ 97,000 $ 147,000  
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 $ 15,454 $ 21,271  
Percentage of total fair value 2.00% 2.00%  
Other privately held investments      
Other Investments [Line Items]      
Other investments, at fair value $ 30,719 $ 44,518  
Percentage of total fair value 4.00% 6.00%  
Overseas deposits      
Other Investments [Line Items]      
Other investments, at fair value $ 63,293 $ 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 $ 65,000 $ 27,000  
Percentage of fair value of other investments subject to redemption restrictions 33.00% 14.00%  
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