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Loss Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Increase (decrease) in loss reserves $ (932) $ 527  
Losses incurred related to prior year notices (48,881) (40,766)  
Premium refund liability, expected claim payments 18,500   $ 21,100
$1,000 Increase/Decrease In Average Severity Reserve Factor      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Increase (decrease) in loss reserves 8,000    
One Percentage Point Increase/Decrease In Average Claim Rate Reserve Factor      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Increase (decrease) in loss reserves 16,000    
Increase (decrease) in estimated claim rate on primary defaults      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Losses incurred related to prior year notices (41,079) (43,431)  
Change in estimates related to severity on primary defaults, pool reserves, LAE reserves, reinsurance, and other      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Losses incurred related to prior year notices $ (7,802) $ 2,665