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EQUITY SECURITIES PORTFOLIO INVESTMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Marketable Securities [Line Items] |  |  |  |
Gain on sale of prepaid investment and derivative |  |  | $ (0) | $ 2,845
Net realized and unrealized gain (loss) on investment | $ 0 | $ 3,081 | 839 | 942
Equity Securites Lf Fund Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 63,907 | 84,299 | 112,180 | 83,230
Equity Securites Derivative [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 0 | 10,651 | 0 | 17,542
Equity Securites Forward Contract [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 0 | (74,662) | 0 | 0
Equity Securities L F Fund Trading Security [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Loss on sale of trading security | 37,112 | 1,908 | 52,167 | (4,202)
Gain on sale of prepaid investment and derivative | 0 |  | 0 | 2,845
Gain on sale of prepaid investment and derivativey |  | 2,845 |  |
L F Fund Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Net realized and unrealized gain (loss) on investment | $ 101,019 | $ 25,041 | $ 164,347 | $ 99,415

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