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Summary of Critical and Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Equity securities: |  |
Carrying Value | $ 100 | $ 200
Total - Marketable securities, amortized cost | 77,788 | 121,636
Total - Marketable securities, gross unrealized loss | 10,007 | (8,893)
Marketable securities, net of allowance for credit losses of zero as of both December 31, 2023 and December 31, 2022 | 87,795 | 112,743
Investment funds - debt securities |  |
Equity securities: |  |
Amortized Cost | 26,460 | 43,155
Gross Unrealized Gain (Loss) | (1,584) | (6,771)
Carrying Value | 24,876 | 36,384
Common stock, preferred stock, and stock funds |  |
Equity securities: |  |
Amortized Cost | 51,328 | 78,481
Gross Unrealized Gain (Loss) | 11,591 | (2,122)
Carrying Value | $ 62,919 | $ 76,359

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