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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
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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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.

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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.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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