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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
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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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

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-Publisher FASB
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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

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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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