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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 3,155,980 |  |  |  |
All outstanding liabilities before 2019, net of reinsurance | 14,586 |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 308,859 |  |  |  |
Accident Year 2019 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 499,468 | $ 480,967 | $ 463,924 | $ 446,997 | $ 335,991
Accident Year 2020 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 734,607 | 645,553 | 604,201 | $ 452,560 |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 725,118 | 665,008 | $ 461,709 |  |
Accident Year 2022 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 736,066 | $ 518,829 |  |  |
Accident Year 2023 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 460,721 |  |  |  |

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