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Provision for Unpaid Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Current year incurred losses and loss adjustment expenses | $ 226,515 | $ 159,461 |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses | 7,738 | $ 959 | $ 2,235 | $ 843
Hurricane |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Current year incurred losses and loss adjustment expenses | 24,700 |  |  |
Reinsurance recoverable on unpaid losses and loss adjustment expenses | $ 28,000 |  |  |

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