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EQUITY SECURITIES PORTFOLIO INVESTMENT - Unrealized and Realized Gains or Losses on Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt and Equity Securities, FV-NI [Line Items]        
Change in fair value of investment     $ 9,960 $ (229,850)
Trading Securites - LF Fund Public Securities        
Debt and Equity Securities, FV-NI [Line Items]        
Change in fair value of investment $ (1,087) $ (32,458) (510) (204,098)
Realized investment gains (losses) 0 5,217 0 64,705
Trading Securites Lf Fund Securities        
Debt and Equity Securities, FV-NI [Line Items]        
Net realized and unrealized gain (loss) on investments $ (1,087) $ (27,241) $ (510) $ (139,393)