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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,317,535 |  |  |  |
All outstanding liabilities before 2017, net of reinsurance | (4,767) |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 207,183 |  |  |  |
Accident Year 2017 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 434,195 | $ 397,509 | $ 365,588 | $ 328,105 | $ 205,200
Accident Year 2018 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 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 | 463,924 | 446,997 | $ 335,991 |  |
Accident Year 2020 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 604,201 | $ 452,560 |  |  |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 461,709 |  |  |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development 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 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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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 http://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 http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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