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INVESTMENTS (DETAILS 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Jun. 30, 2015
Dec. 31, 2013
Other Investments [Line Items]          
Other investments $ 800,319 $ 800,319 $ 965,465    
Percentage of total fair value 100.00% 100.00% 100.00%    
Hedge Funds [Member] | Lockup Redemption Restriction [Member]          
Other Investments [Line Items]          
Fair value of other investments subject to redemption restrictions $ 90,000 $ 90,000 $ 87,000    
Percentage of fair value of other investments subject to redemption restrictions 14.00% 14.00% 11.00%    
Long/short equity funds [Member]          
Other Investments [Line Items]          
Other investments $ 154,099 $ 154,099 $ 298,907    
Percentage of total fair value 19.00% 19.00% 31.00%    
Redemption frequency   Quarterly, Semi-annually, Annually Quarterly, Semi-annually    
Long/short equity funds [Member] | Minimum [Member]          
Other Investments [Line Items]          
Redemption notice period   45 days 30 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 $ 341,452 $ 341,452 $ 324,020    
Percentage of total fair value 43.00% 43.00% 34.00%    
Redemption frequency   Quarterly, Semi-annually Quarterly, Semi-annually    
Optional extension of investment term   3 years      
Multi-strategy funds [Member] | Other Redemption Restriction [Member]          
Other Investments [Line Items]          
Unfunded commitments related to other investments $ 23,000 $ 23,000     $ 60,000
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 $ 140,343 $ 140,343 $ 185,899    
Percentage of total fair value 18.00% 18.00% 19.00%    
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 $ 75 $ 75 $ 9,713    
Percentage of total fair value 0.00% 0.00% 1.00%    
Redemption frequency     Quarterly    
Redemption notice period     65 days    
Direct Lending Funds [Member]          
Other Investments [Line Items]          
Other investments $ 79,283 $ 79,283 $ 54,438    
Percentage of total fair value 10.00% 10.00% 6.00%    
Optional extension of investment term   3 years      
Direct Lending Funds [Member] | Other Redemption Restriction [Member]          
Other Investments [Line Items]          
Fair value of other investments subject to redemption restrictions $ 79,283 $ 79,283 $ 54,438    
Percentage of fair value of other investments subject to redemption restrictions 10.00% 10.00% 6.00%    
Unfunded commitments related to other investments $ 234,000 $ 234,000 $ 88,000    
Direct Lending Funds [Member] | Minimum [Member]          
Other Investments [Line Items]          
Investment term   5 years      
Direct Lending Funds [Member] | Maximum [Member]          
Other Investments [Line Items]          
Investment term   10 years      
Real Estate Funds [Member]          
Other Investments [Line Items]          
Other investments $ 4,369 $ 4,369 $ 0    
Percentage of total fair value 1.00% 1.00% 0.00%    
Investment term 8 years        
Real Estate Funds [Member] | Other Redemption Restriction [Member]          
Other Investments [Line Items]          
Unfunded commitments related to other investments $ 95,000 $ 95,000   $ 100,000  
Commitment period 3 years        
CLO-Equities [Member]          
Other Investments [Line Items]          
Other investments $ 80,698 $ 80,698 $ 92,488    
Percentage of total fair value 9.00% 9.00% 9.00%    
Bank Revolver Opportunity Funds [Member]          
Other Investments [Line Items]          
Investment term 7 years        
Optional extension of investment term 2 years        
Bank Revolver Opportunity Funds [Member] | Other Redemption Restriction [Member]          
Other Investments [Line Items]          
Unfunded commitments related to other investments $ 50,000 $ 50,000