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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 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 909,810 945,013
Prior years (5,845) (15,484)
Total incurred losses and loss adjustment expenses 903,965 929,529
Loss and loss adjustment expense payments related to:    
Current year 301,198 310,102
Prior years 527,348 531,755
Total payments 828,546 841,857
Net reserves, end of period 2,828,973 2,647,260
Reinsurance recoverables on unpaid losses, end of period 30,247 30,301
Gross reserves, end of period $ 2,859,220 $ 2,677,561