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Investments in Securities and Fair Value Investments in Securities (Schedule of Earnings on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 9,055 | $ 4,704
Fixed maturity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 2,317 | 1,902
Equity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 1,078 | 1,425
Invested cash and other short-term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | 5,659 | 1,375
Miscellaneous interest |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Interest and dividends | $ 1 | $ 2

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