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Reinsurance - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2020 | Dec. 31, 2023 | Dec. 31, 2020 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2022
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums receivable balance, credit provisions |  | $ 3,000 |  | $ 2,008 | $ 2,742 | $ 2,008 | $ 2,742 | $ 3,000 | $ 1,962 | $ 3,098 | $ 2,856
Premiums receivable |  | 658,363 |  | 885,744 |  | 885,744 |  | 658,363 |  |  |
Paid losses recoverable |  | 145,202 |  | 146,008 |  | 146,008 |  | 145,202 |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | 1,161,077 |  | 1,190,465 | 1,157,123 | 1,190,465 | 1,157,123 | 1,161,077 |  |  | 1,177,863
Reinsurance recoverable, provisions |  | 687 |  | 833 | 691 | 833 | 691 | 687 | $ 755 | $ 820 | $ 777
Reinsurance premiums ceded |  |  |  | 75,505 | 90,557 | 410,802 | 400,475 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance premiums ceded |  |  |  | 0 | 0 | 14,600 | 7,200 |  |  |  |
Risk transfer capacity |  | 200,000 | $ 150,000 |  |  |  |  |  |  |  |
Reinsurance Contract [Axis]: Loss Portfolio Transfer Agreement |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unpaid losses and loss adjustment expenses recoverable |  | $ 49,800 |  | 44,200 |  | 44,200 |  | $ 49,800 |  |  |
Reinsurance premiums ceded | $ 72,100 |  |  |  |  |  |  |  |  |  |
Amortization of the deferred gain |  |  |  | $ (600) | $ (900) | $ 1,300 | $ 2,500 |  |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
% of total paid and unpaid losses and loss adjustment expenses recoverable |  |  |  |  |  | 100.00% |  | 100.00% |  |  |
Reinsurer One | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
% of total paid and unpaid losses and loss adjustment expenses recoverable |  |  |  |  |  | 24.00% |  | 27.00% |  |  |
Reinsurer Two | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
% of total paid and unpaid losses and loss adjustment expenses recoverable |  |  |  |  |  | 21.00% |  | 20.00% |  |  |
Reinsurer Three | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
% of total paid and unpaid losses and loss adjustment expenses recoverable |  |  |  |  |  | 13.00% |  | 12.00% |  |  |

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