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INVESTMENTS (DETAILS 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Other Investments [Line Items]    
Other investments $ 830,219 $ 816,756
Percentage of total fair value 100.00% 100.00%
Unfunded commitments related to other investments $ 401,000 $ 379,000
Hedge Funds [Member] | Lockup Redemption Restriction [Member]    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions $ 60,000 $ 66,000
Percentage of fair value of other investments subject to redemption restrictions 12.00% 10.00%
Long/short equity funds [Member]    
Other Investments [Line Items]    
Other investments $ 118,619 $ 154,348
Percentage of total fair value 14.00% 19.00%
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 $ 285,992 $ 355,073
Percentage of total fair value 34.00% 43.00%
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 $ 93,539 $ 147,287
Percentage of total fair value 11.00% 18.00%
Redemption notice period 45 days  
Event driven funds [Member] | Minimum [Member]    
Other Investments [Line Items]    
Redemption notice period   45 days
Event driven funds [Member] | Maximum [Member]    
Other Investments [Line Items]    
Redemption notice period   60 days
Leveraged bank loan funds [Member]    
Other Investments [Line Items]    
Other investments $ 0 $ 65
Percentage of total fair value 0.00% 0.00%
Direct Lending Funds [Member]    
Other Investments [Line Items]    
Other investments $ 134,650 $ 90,120
Percentage of total fair value 16.00% 11.00%
Direct Lending Funds [Member] | Other Redemption Restriction [Member]    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 176,000 $ 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 $ 81,223 $ 0
Percentage of total fair value 10.00% 0.00%
Unfunded commitments related to other investments $ 24,000  
Investment term 10 years  
Real Estate Funds [Member]    
Other Investments [Line Items]    
Other investments $ 13,354 $ 4,929
Percentage of total fair value 2.00% 1.00%
Real Estate Funds [Member] | Other Redemption Restriction [Member]    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 140,000 $ 95,000
Commitment period 3 years  
Real Estate Funds [Member] | Minimum [Member] | Other Redemption Restriction [Member]    
Other Investments [Line Items]    
Investment term 6 years  
Real Estate Funds [Member] | Maximum [Member] | Other Redemption Restriction [Member]    
Other Investments [Line Items]    
Investment term 8 years  
CLO-Equities [Member]    
Other Investments [Line Items]    
Other investments $ 60,700 $ 64,934
Percentage of total fair value 8.00% 8.00%
Other Privately Held Investments [Member]    
Other Investments [Line Items]    
Other investments $ 42,142 $ 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