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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities $ 2,420,897      
Reinsurance recoverables on unpaid losses 25,323      
Insurance lines other than short-duration 1,077      
Unallocated claims adjustment expenses 137,613      
Unallocated claims adjustment expenses, aggregate reconciling items 138,690      
Total gross loss and loss adjustment expense reserves 2,584,910 $ 2,226,430 $ 1,991,304 $ 1,921,255
Property insurance product line, automobile        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 1,905,140      
Reinsurance recoverables on unpaid losses 17,341      
Property insurance product line, homeowners'        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 340,309      
Reinsurance recoverables on unpaid losses 6,952      
Other Short-duration Insurance Product Line        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities 175,448      
Reinsurance recoverables on unpaid losses $ 1,030