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EQUITY SECURITIES PORTFOLIO INVESTMENT (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of unrealized gains or losses
                    
   Three Months Ended   Nine Months Ended 
   September 30,   September 30, 
   2021   2020   2021   2020 
   (In thousands) 
Change in fair value of equity securities  $63,907   $84,299   $112,180   $83,230 
Change in fair value of equity securities derivative       10,651        17,542 
Change in fair value of equity securities forward contract       (74,662)        
Gain (loss) on sale of equity securities   37,112    1,908    52,167    (4,202)
Gain on sale of prepaid investment and derivative       2,845        2,845 
Net realized and unrealized gain  $101,019   $25,041   $164,347   $99,415