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Summary of Critical and Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity securities: |  |  |
Gross Unrealized Loss | $ (57,983) | $ 33,104 | $ 12,515
Carrying Value | 200 | 800 |
Available for sale |  |  |
Total - Marketable securities, amortized cost | 121,636 | 142,398 |
Total - Marketable securities, gross unrealized gain (loss) | (8,893) | 49,431 |
Total - Marketable securities, carrying value | 112,743 | 191,829 |
Investment funds - debt securities |  |  |
Equity securities: |  |  |
Amortized Cost | 43,155 | 62,192 |
Gross Unrealized Loss | (6,771) | (502) |
Carrying Value | 36,384 | 61,690 |
Common stock, preferred stock, and stock funds |  |  |
Equity securities: |  |  |
Amortized Cost | 78,481 | 79,155 |
Gross Unrealized Loss | (2,122) | 49,592 |
Carrying Value | $ 76,359 | 128,747 |
Investment-grade unsecured debt |  |  |
Available for sale |  |  |
Amortized Cost |  | 1,051 |
Gross Unrealized Loss |  | 341 |
Carrying Value |  | $ 1,392 |

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