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INVESTMENTS (Details 5) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Investments [Line Items]      
Other investments, at fair value $ 780,395 $ 830,219  
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 $ 57,000 $ 60,000  
Percentage of fair value of other investments subject to redemption restrictions 14.00% 12.00%  
Long/short equity funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 56,982 $ 118,619  
Percentage of total fair value 7.00% 14.00%  
Redemption notice period 60 days    
Long/short equity funds [Member] | Minimum [Member]      
Other Investments [Line Items]      
Redemption notice period   45 days  
Long/short equity funds [Member] | Maximum [Member]      
Other Investments [Line Items]      
Redemption notice period   60 days  
Multi-strategy funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 307,575 $ 285,992  
Percentage of total fair value 39.00% 34.00%  
Multi-strategy funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 19,000 $ 12,000  
Multi-strategy funds [Member] | Minimum [Member]      
Other Investments [Line Items]      
Redemption notice period 60 days 60 days  
Multi-strategy funds [Member] | Minimum [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Optional extension of investment term 2 years    
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 $ 50,242 $ 93,539  
Percentage of total fair value 6.00% 11.00%  
Redemption notice period 45 days 45 days  
Direct Lending Funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 178,390 $ 134,650  
Percentage of total fair value 23.00% 16.00%  
Direct Lending Funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 179,000 $ 176,000  
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 $ 72,465 $ 81,223  
Percentage of total fair value 9.00% 10.00%  
Unfunded commitments related to other investments $ 21,000 $ 24,000  
Investment term 10 years    
Real Estate Funds [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 17,971 $ 13,354  
Percentage of total fair value 2.00% 2.00%  
Real Estate Funds [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Unfunded commitments related to other investments $ 135,000 $ 140,000  
Commitment period 3 years    
Real Estate Funds [Member] | Minimum [Member] | Other Redemption Restriction [Member]      
Other Investments [Line Items]      
Investment term 7 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, at fair value $ 54,392 $ 60,700  
Percentage of total fair value 9.00% 8.00%  
Other Privately Held Investments [Member]      
Other Investments [Line Items]      
Other investments, at fair value $ 42,378 $ 42,142  
Percentage of total fair value 5.00% 5.00%  
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