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LF EQUITY INCOME FUND PORTFOLIO INVESTMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Marketable Securities [Line Items] |  |  |  |
Net realized and unrealized gain (loss) on investment | $ 0 | $ 3,231 | $ 839 | $ 4,023
Equity Securites Lf Fund Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 11,097 | (1,069) | 48,273 | (1,069)
Equity Securites Derivative [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 0 | 6,891 | 0 | 6,891
Equity Securites Forward Contract [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Change in fair value of investment | 0 | 74,662 | 0 | 74,662
Equity Securities L F Fund Trading Security [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Loss on sale of trading security | 15,055 | (6,110) | 15,055 | (6,110)
L F Fund Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Net realized and unrealized gain (loss) on investment | $ 26,152 | $ 74,374 | $ 63,328 | $ 74,374

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