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Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Nov. 23, 2021
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | $ 104,411 | $ 105,515 |
Estimated Fair Value | 95,715 | 105,476 |
Surplus note |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | $ 4,411 | 5,515 |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Stated percentage | 5.625% |  | 5.625%
Surplus note | Surplus note |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | $ 4,411 | 5,515 |
Estimated Fair Value | 4,151 | 5,126 |
5.625% Senior unsecured notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | 100,000 | 100,000 |
Estimated Fair Value | $ 91,564 | $ 100,350 |

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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