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Liability for Unpaid Claims and Claim Adjustment Expenses - Rollforward of Claims Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Policy liabilities and unpaid claims balance as of January 1,     $ 331,703 $ 233,438
Less: liabilities of policy-holder account balances, gross     (801) (5,419)
Less: non-insurance warranty benefit claim liabilities     (10,785) (30,664)
Gross liabilities for unpaid losses and loss adjustment expenses     320,117 197,355
Net balance as of January 1, short duration     154,412 83,945
Incurred (short duration) related to:        
Current year     265,277 176,644
Prior years     (2,205) 3,866
Total incurred $ 97,501 $ 61,061 263,072 180,510
Paid (short duration) related to:        
Current year     138,274 116,175
Prior years     18,436 6,379
Total paid     156,710 122,554
Gross liabilities for unpaid losses and loss adjustment expenses 509,349 296,811 509,349 296,811
Plus: liabilities of policy-holder account balances, gross 2,715 1,690 2,715 1,690
Plus: non-insurance warranty benefit claim liabilities 860 15,113 860 15,113
Policy liabilities and unpaid claims balance as of September 30, 512,924 313,614 512,924 313,614
Short duration        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Reinsurance recoverable for unpaid claims and claims adjustments, beginning balance     (165,129) (113,163)
Paid (short duration) related to:        
Net balance as of September 30, short duration 260,774 141,901 260,774 141,901
Reinsurance recoverable for unpaid claims and claims adjustments, ending balance 248,418 154,513 248,418 154,513
Other lines        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Reinsurance recoverable for unpaid claims and claims adjustments, beginning balance     (576) (247)
Paid (short duration) related to:        
Reinsurance recoverable for unpaid claims and claims adjustments, ending balance $ 157 $ 397 $ 157 $ 397