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INVESTMENTS - Other Investments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
fund
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2015
USD ($)
Other Investments [Line Items]        
Other investments, at fair value $ 954,602 $ 947,982    
Percentage of total fair value (as a percent) 100.00% 100.00%    
Long/short equity funds        
Other Investments [Line Items]        
Other investments, at fair value $ 3,056 $ 3,476    
Percentage of total fair value (as a percent) 0.00% 0.00%    
Redemption notice period 60 days 60 days    
Multi-strategy funds        
Other Investments [Line Items]        
Other investments, at fair value $ 48,561 $ 56,012    
Percentage of total fair value (as a percent) 5.00% 6.00%    
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 90 days 90 days    
Multi-strategy funds | Other Redemption Restriction        
Other Investments [Line Items]        
Unfunded commitments related to other investments $ 26,000   $ 23,000  
Multi-strategy funds | Other Redemption Restriction | Minimum        
Other Investments [Line Items]        
Investment term 2 years      
Direct lending funds        
Other Investments [Line Items]        
Other investments, at fair value $ 276,211 $ 289,867    
Percentage of total fair value (as a percent) 29.00% 31.00%    
Redemption notice period 90 days 90 days    
Direct lending funds | Other Redemption Restriction        
Other Investments [Line Items]        
Unfunded commitments related to other investments $ 203,000   224,000  
Optional extension of investment term 3 years      
Direct lending funds | Other Redemption Restriction | Minimum        
Other Investments [Line Items]        
Investment term 4 years      
Direct lending funds | Other Redemption Restriction | Maximum        
Other Investments [Line Items]        
Investment term 10 years      
Direct lending funds | Quarterly Redemption        
Other Investments [Line Items]        
Other investments, at fair value $ 48,000   47,000  
Number of funds | fund 1      
Private equity funds        
Other Investments [Line Items]        
Other investments, at fair value $ 260,596 $ 249,974    
Percentage of total fair value (as a percent) 27.00% 26.00%    
Private equity funds | Other Redemption Restriction        
Other Investments [Line Items]        
Unfunded commitments related to other investments $ 187,000 $ 178,000    
Investment term 5 years      
Real estate funds        
Other Investments [Line Items]        
Other investments, at fair value $ 245,823 $ 238,222    
Percentage of total fair value (as a percent) 26.00% 25.00%    
Redemption notice period   45 days    
Real estate funds | Minimum        
Other Investments [Line Items]        
Redemption notice period 45 days      
Real estate funds | Maximum        
Other Investments [Line Items]        
Redemption notice period 90 days      
Real estate funds | Other Redemption Restriction        
Other Investments [Line Items]        
Unfunded commitments related to other investments $ 198,000 $ 173,000    
Real estate funds | Other Redemption Restriction | Minimum        
Other Investments [Line Items]        
Investment term 2 years      
Real estate funds | Quarterly Or Annual Redemption        
Other Investments [Line Items]        
Other investments, at fair value $ 76,000   73,000  
Number of funds | fund 2      
CLO-Equities        
Other Investments [Line Items]        
Other investments, at fair value $ 4,881 $ 5,910    
Percentage of total fair value (as a percent) 1.00% 1.00%    
Other privately held investments        
Other Investments [Line Items]        
Other investments, at fair value $ 115,474 $ 104,521    
Percentage of total fair value (as a percent) 12.00% 11.00%    
Hedge funds | Lockup Redemption Restriction        
Other Investments [Line Items]        
Fair value of other investments subject to redemption restrictions $ 0   $ 3,000  
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