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17. LF Equity Income Fund Portfolio Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Change in fair value of investment | $ 175,855 | $ 0
Loss on sale of trading security | (1,085) | 0
Net realized and unrealized gain (loss) on investment | 13,661 | 669
Trading Securites - LF Fund Public Securities [Member] |  |
Change in fair value of investment | 72,104 | 0
Loss on sale of trading security | (3,930) | 0
Equity Securities - LF Fund Private Securities [Member] |  |
Change in fair value of investment | 103,751 | 0
Equity Securities Forward Contract [Member] |  |
Loss on sale of trading security | 2,845 | 0
Trading Securites Lf Fund Securities [Member] |  |
Net realized and unrealized gain (loss) on investment | $ 174,770 | $ 0

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