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Organization and Basis of Presentation - Summary of Financial Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Equity securities: |  |  |
Gross Unrealized Gain (Loss) | $ 23,772 | $ 2,215 |
Carrying Value | 2,500 |  | $ 2,500
Available for sale |  |  |
Equity and Debt Securities, Amortized Cost | 143,014 |  | 131,770
Equity and Debt Securities, Gross Unrealized Gain (Loss) | 40,126 |  | 15,998
Equity and Debt Securities, Marketable Securities | 183,140 |  | 147,768
Investment funds - debt securities |  |  |
Equity securities: |  |  |
Cost | 61,885 |  | 49,646
Gross Unrealized Gain (Loss) | 24 |  | 985
Carrying Value | 61,909 |  | 50,631
Common stock and stock funds |  |  |
Equity securities: |  |  |
Cost | 80,079 |  | 81,074
Gross Unrealized Gain (Loss) | 39,734 |  | 15,001
Carrying Value | 119,813 |  | 96,075
Investment-grade unsecured debt |  |  |
Available for sale |  |  |
Cost | 1,050 |  | 1,050
Gross Unrealized Gain (Loss) | 368 |  | 12
Carrying Value | $ 1,418 |  | $ 1,062

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