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Loss Reserves (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Increase (decrease) in loss reserves $ (10,508) $ (27,765)  
Losses incurred related to prior year notices (104,337) (116,270)  
Premium refund liability, expected claim payments 10,300   $ 12,500
$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 6,000    
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 17,000    
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 (98,645) (101,008)  
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 $ (5,692) $ (15,262)