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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserves, beginning of period $ 2,785,702 $ 2,584,910
Reinsurance recoverables on unpaid losses 32,148 25,322
Net reserves, beginning of period 2,753,554 2,559,588
Incurred losses and loss adjustment expenses related to:    
Current year 1,832,701 1,847,123
Prior years 7,978 (19,784)
Total incurred losses and loss adjustment expenses 1,840,679 1,827,339
Loss and loss adjustment expense payments related to:    
Current year 801,750 874,245
Prior years 846,290 820,341
Total payments 1,648,040 1,694,586
Net reserves, end of period 2,946,193 2,692,341
Reinsurance recoverables on unpaid losses, end of period 30,210 27,666
Gross reserves, end of period $ 2,976,403 $ 2,720,007