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INVESTMENTS - Other Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Investments [Line Items]      
Other investments $ 1,009,373 $ 830,219  
Percentage of total fair value 100.00% 100.00%  
Unfunded commitments related to other investments $ 414,000 $ 401,000  
Hedge funds | Lockup Redemption Restriction      
Other Investments [Line Items]      
Fair value of other investments subject to redemption restrictions $ 38,000 $ 60,000  
Percentage of fair value of other investments subject to redemption restrictions 11.00% 12.00%  
Long/short equity funds      
Other Investments [Line Items]      
Other investments $ 38,470 $ 118,619  
Percentage of total fair value 4.00% 14.00%  
Redemption notice period 60 days    
Long/short equity funds | Minimum      
Other Investments [Line Items]      
Redemption notice period   45 days  
Long/short equity funds | Maximum      
Other Investments [Line Items]      
Redemption notice period   60 days  
Multi-strategy funds      
Other Investments [Line Items]      
Other investments $ 286,164 $ 285,992  
Percentage of total fair value 28.00% 34.00%  
Multi-strategy funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 16,000 $ 12,000  
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 95 days 95 days  
Event-driven funds      
Other Investments [Line Items]      
Other investments $ 39,177 $ 93,539  
Percentage of total fair value 4.00% 11.00%  
Redemption notice period 45 days 45 days  
Direct lending funds      
Other Investments [Line Items]      
Other investments $ 250,681 $ 134,650  
Percentage of total fair value 25.00% 16.00%  
Direct lending funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 137,000 $ 176,000  
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 $ 68,812 $ 81,223  
Percentage of total fair value 7.00% 10.00%  
Unfunded commitments related to other investments $ 21,000 $ 24,000  
Investment term 10 years    
Real estate funds      
Other Investments [Line Items]      
Other investments $ 50,009 $ 13,354  
Percentage of total fair value 5.00% 2.00%  
Real estate funds | Other Redemption Restriction      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 115,000 $ 140,000  
Real estate funds | Minimum | Other Redemption Restriction      
Other Investments [Line Items]      
Investment term 7 years    
CLO-Equities      
Other Investments [Line Items]      
Other investments $ 31,413 $ 60,700  
Percentage of total fair value 2.00% 8.00%  
Other privately held investments      
Other Investments [Line Items]      
Other investments $ 46,430 $ 42,142  
Percentage of total fair value 5.00% 5.00%  
Overseas deposits      
Other Investments [Line Items]      
Other investments $ 198,217 $ 0  
Percentage of total fair value 20.00% 0.00%  
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    
Open-ended commercial mortgage income fund      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 75,000