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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,663,923 |  |  |  |
All outstanding liabilities before 2018, net of reinsurance | (9,542) |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 221,171 |  |  |  |
Accident Year 2018 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 353,566 | $ 353,506 | $ 348,225 | $ 327,310 | $ 253,008
Accident Year 2019 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 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 | 645,553 | 604,201 | $ 452,560 |  |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 665,008 | $ 461,709 |  |  |
Accident Year 2022 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 518,829 |  |  |  |

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- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671315-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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