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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Apr. 03, 2020
USD ($)
Apr. 03, 2020
GBP (£)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jan. 19, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 01, 2023
USD ($)
Dec. 03, 2020
Offsetting Liabilities [Line Items]                    
Fair value of investment     $ 14,100   $ 14,100     $ 63,068    
Earnings on equity investment in joint venture     0 $ 3,375 0 $ 3,375        
Life Sciences Portfolio                    
Offsetting Liabilities [Line Items]                    
Investment at fair value     25,700   25,700     $ 82,800    
Acacia                    
Offsetting Liabilities [Line Items]                    
Distributions received       2,200   2,200        
Noncontrolling Interests                    
Offsetting Liabilities [Line Items]                    
Distributions received       $ 1,100   1,100        
Arix                    
Offsetting Liabilities [Line Items]                    
Fair value of investment     $ 0   0   $ 57,100   $ 57,100  
MalinJ1                    
Offsetting Liabilities [Line Items]                    
Ownership percentage                   63.90%
Earnings on equity investment in joint venture         $ 0 $ 3,400        
MalinJ1 | MalinJ1                    
Offsetting Liabilities [Line Items]                    
Equity method investment ownership     41.00%   41.00%          
Option Agreement | Portfolio Companies                    
Offsetting Liabilities [Line Items]                    
Payments to acquire investments $ 277,500 £ 223.9