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Summary of Critical and Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity securities: |  |  |
Gross Unrealized (Loss) Gain | $ 33,104 | $ 12,515 | $ 5,710
Carrying Value | 800 | 2,500 |
Available for sale |  |  |
Total - Marketable securities, amortized cost | 142,398 | 131,770 |
Total - Marketable securities, gross unrealized gain (loss) | 49,431 | 15,998 |
Total - Marketable securities, carrying value | 191,829 | 147,768 |
Proceeds from sale and maturities of marketable securities | 16,600 | 113,500 | 147,500
Marketable securities, realized gain (loss) | 3,400 | 2,100 | 1,300
Unrealized gain (loss) on equity securities recognized through income | 33,104 | 12,515 | $ 5,710
Investment funds - debt securities |  |  |
Equity securities: |  |  |
Amortized Cost | 62,192 | 49,646 |
Gross Unrealized (Loss) Gain | (502) | 985 |
Carrying Value | 61,690 | 50,631 |
Available for sale |  |  |
Unrealized gain (loss) on equity securities recognized through income | (502) | 985 |
Common stock and stock funds |  |  |
Equity securities: |  |  |
Amortized Cost | 79,155 | 81,074 |
Gross Unrealized (Loss) Gain | 49,592 | 15,001 |
Carrying Value | 128,747 | 96,075 |
Available for sale |  |  |
Unrealized gain (loss) on equity securities recognized through income | 49,592 | 15,001 |
Investment-grade unsecured debt |  |  |
Available for sale |  |  |
Amortized Cost | 1,051 | 1,050 |
Gross Unrealized (Loss) Gain | 341 | 12 |
Carrying Value | $ 1,392 | $ 1,062 |

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