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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,006,358 |  |  |  |
All outstanding liabilities before 2016, net of reinsurance | 28 |  |  |  |
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 179,114 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 361,067 | $ 349,837 | $ 328,286 | $ 297,374 | $ 204,122
Accident Year 2017 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 397,509 | 365,588 | 328,105 | $ 205,200 |
Accident Year 2018 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 348,225 | 327,310 | $ 253,008 |  |
Accident Year 2019 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 446,997 | $ 335,991 |  |  |
Accident Year 2020 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 452,560 |  |  |  |

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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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