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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended
Apr. 03, 2020
USD ($)
Apr. 03, 2020
GBP (£)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 03, 2020
Offsetting Liabilities [Line Items]            
Fair value of investment     $ 22,918   $ 63,068  
Net loss including noncontrolling interests in subsidiaries     (186) $ 9,447    
Net income attributable to noncontrolling interests in subsidiaries     (3) $ 0    
Life Sciences Portfolio            
Offsetting Liabilities [Line Items]            
Investment at fair value     25,700   $ 82,800  
Arix            
Offsetting Liabilities [Line Items]            
Fair value of investment     0      
MalinJ1            
Offsetting Liabilities [Line Items]            
Ownership percentage           63.90%
Earnings on equity investment in joint venture     $ 0      
MalinJ1 | MalinJ1            
Offsetting Liabilities [Line Items]            
Equity method investment ownership     41.00%      
Option Agreement | Portfolio Companies            
Offsetting Liabilities [Line Items]            
Payments to acquire investments $ 277,500 £ 223.9