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INVESTMENTS - Summary of Portfolio of Other Investments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
fund
Dec. 31, 2021
USD ($)
Other Investments [Line Items]    
Asset fair value $ 996,751 $ 947,982
Percentage of total fair value 100.00% 100.00%
Unfunded commitments related to other investments $ 508,000 $ 649,000
Long/short equity funds    
Other Investments [Line Items]    
Asset fair value $ 0 $ 3,476
Percentage of total fair value 0.00% 0.00%
Redemption notice period   60 days
Multi-strategy funds    
Other Investments [Line Items]    
Asset fair value $ 32,616 $ 56,012
Percentage of total fair value 3.00% 6.00%
Multi-strategy funds | Other Redemption Restriction    
Other Investments [Line Items]    
Redemption notice period 2 years  
Unfunded commitments related to other investments $ 26,000 $ 23,000
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
Direct lending funds    
Other Investments [Line Items]    
Asset fair value $ 258,626 $ 289,867
Percentage of total fair value 26.00% 31.00%
Redemption notice period 90 days 90 days
Direct lending funds | Quarterly Redemption    
Other Investments [Line Items]    
Asset fair value $ 39,000 $ 47,000
Number of funds | fund 1  
Direct lending funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 183,000 224,000
Optional extension of investment term 3 years  
Direct lending funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 4 years  
Direct lending funds | Maximum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 10 years  
Private equity funds    
Other Investments [Line Items]    
Asset fair value $ 265,836 $ 249,974
Percentage of total fair value 27.00% 26.00%
Private equity funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 158,000 $ 178,000
Investment term 5 years  
Real estate funds    
Other Investments [Line Items]    
Asset fair value $ 298,499 $ 238,222
Percentage of total fair value 30.00% 25.00%
Redemption notice period   45 days
Real estate funds | Quarterly Redemption    
Other Investments [Line Items]    
Asset fair value $ 73,000 $ 73,000
Number of funds | fund 1  
Real estate funds | Annually Redemption    
Other Investments [Line Items]    
Asset fair value $ 27,000 0
Number of funds | fund 1  
Real estate funds | Other Redemption Restriction    
Other Investments [Line Items]    
Unfunded commitments related to other investments $ 141,000 173,000
Real estate funds | Minimum    
Other Investments [Line Items]    
Redemption notice period 45 days  
Real estate funds | Minimum | Other Redemption Restriction    
Other Investments [Line Items]    
Investment term 2 years  
Real estate funds | Maximum    
Other Investments [Line Items]    
Redemption notice period 90 days  
CLO-Equities    
Other Investments [Line Items]    
Asset fair value $ 5,016 $ 5,910
Percentage of total fair value 0.00% 1.00%
Other privately held investments    
Other Investments [Line Items]    
Asset fair value $ 136,158 $ 104,521
Percentage of total fair value 14.00% 11.00%
Hedge funds | Lockup Redemption Restriction    
Other Investments [Line Items]    
Fair value of other investments subject to redemption restrictions $ 0 $ 3,000