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EQUITY SECURITIES PORTFOLIO INVESTMENT - Unrealized and Realized Gains or Losses on Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Debt and Equity Securities, FV-NI [Line Items]        
Change in fair value of investment     $ (35,519) $ 18,783
Trading Securites - LF Fund Public Securities        
Debt and Equity Securities, FV-NI [Line Items]        
Change in fair value of investment $ 0 $ 8,187 (28,581) 7,677
Realized investment gains (losses) 0 0 28,581 0
Trading Securites Lf Fund Securities        
Debt and Equity Securities, FV-NI [Line Items]        
Net realized and unrealized gain (loss) on investments $ 0 $ 8,187 $ 0 $ 7,677