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Loss And Loss Adjustment Expense Reserves - Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Loss and Loss Adjustment Expense Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities $ 2,970,466      
Reinsurance recoverables on unpaid losses 28,645      
Insurance lines other than short-duration 1,114      
Unallocated claims adjustment expenses 151,806      
Unallocated claims adjustment expenses, aggregate reconciling items 152,920      
Total gross loss and loss adjustment expense reserves 3,152,031 $ 2,785,702 $ 2,584,910 $ 2,226,430
Property insurance product line, automobile        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 2,234,230      
Reinsurance recoverables on unpaid losses 26,499      
Property insurance product line, homeowners'        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 424,221      
Reinsurance recoverables on unpaid losses 1,273      
Property insurance product line, commercial property        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 213,066      
Reinsurance recoverables on unpaid losses 392      
Other Short-duration Insurance Product Line        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 98,949      
Reinsurance recoverables on unpaid losses $ 481