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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES : Trading Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities - cost | $ 44,556 | $ 36,851
Available-for-sale Securities, Gross Unrealized Gain | 91,131 | 74,099
Available-for-sale Securities, Gross Unrealized Loss | (749) | (1,847)
Equity securities at fair value | 134,938 | 109,103
Equity Securites Lf Fund Public Securities [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities - cost | 31,665 | 32,765
Available-for-sale Securities, Gross Unrealized Gain | 90,312 | 72,689
Available-for-sale Securities, Gross Unrealized Loss | (539) | (583)
Equity securities at fair value | 121,438 | 104,871
Equity Securities Other Equity [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities - cost | 12,891 | 4,086
Available-for-sale Securities, Gross Unrealized Gain | 819 | 1,410
Available-for-sale Securities, Gross Unrealized Loss | (210) | (1,264)
Equity securities at fair value | $ 13,500 | $ 4,232

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