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INVESTMENTS (DETAILS 5) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Mar. 01, 2016
Other Investments [Line Items]      
Other investments, at fair value $ 847,262 $ 816,756  
Percentage of total fair value 100.00% 100.00%  
Hedge Funds [Member] | Lockup Redemption Restriction [Member]      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 87,000 $ 66,000  
Percentage of fair value of other investments subject to redemption restrictions 17.00% 10.00%  
Long/short equity funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 139,460 $ 154,348  
Percentage of total fair value 16.00% 19.00%  
Redemption frequency Quarterly, Semi-annually, Annually Quarterly, Semi-annually, Annually  
Long/short equity funds [Member] | Minimum [Member]      
Other Investments [Line Items]      
Redemption notice period 45 days 45 days  
Long/short equity funds [Member] | Maximum [Member]      
Other Investments [Line Items]      
Redemption notice period 60 days 60 days  
Multi-strategy funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 281,153 $ 355,073  
Percentage of total fair value 33.00% 43.00%  
Redemption frequency Quarterly, Semi-annually Quarterly, Semi-annually  
Multi-strategy funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 12,000 $ 12,000  
Optional extension of investment term 3 years    
Multi-strategy funds [Member] | Minimum [Member]      
Other Investments [Line Items]      
Redemption notice period 60 days 60 days  
Multi-strategy funds [Member] | Maximum [Member]      
Other Investments [Line Items]      
Redemption notice period 95 days 95 days  
Event driven funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 94,012 $ 147,287  
Percentage of total fair value 11.00% 18.00%  
Redemption frequency Quarterly, Annually Quarterly, Annually  
Event driven funds [Member] | Minimum [Member]      
Other Investments [Line Items]      
Redemption notice period 45 days 45 days  
Event driven funds [Member] | Maximum [Member]      
Other Investments [Line Items]      
Redemption notice period 60 days 60 days  
Leveraged bank loan funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 0 $ 65  
Percentage of total fair value 0.00% 0.00%  
Direct Lending Funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 125,002 $ 90,120  
Percentage of total fair value 15.00% 11.00%  
Direct Lending Funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 189,000 $ 222,000  
Optional extension of investment term 3 years    
Direct Lending Funds [Member] | Minimum [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Investment term 5 years    
Direct Lending Funds [Member] | Maximum [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Investment term 10 years    
Private Equity Funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 89,170 $ 0  
Percentage of total fair value 11.00% 0.00%  
Unfunded commitments related to other investments $ 40,000   $ 135,000
Investment term 10 years    
Real Estate Funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 11,782 $ 4,929  
Percentage of total fair value 1.00% 1.00%  
Real Estate Funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 90,000 $ 95,000  
Investment term 8 years    
Commitment period 3 years    
CLO-Equities [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 63,783 $ 64,934  
Percentage of total fair value 8.00% 8.00%  
Other Privately Held Investments [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 42,900 $ 0  
Percentage of total fair value 5.00% 0.00%  
Bank Revolver Opportunity Funds [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments   $ 50,000  
Investment term 7 years    
Optional extension of investment term 2 years