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Reserves for Loss and Loss Expenses (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Net reserves at beginning of period $ 15,661,820 $ 14,248,879  
Net provision for losses and loss expenses:      
Claims occurring during the current year 3,411,888 3,064,046  
Decrease in estimates for claims occurring in prior years 14,700 28,853  
Loss reserve discount accretion 17,786 15,510  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 3,444,374 3,108,409  
Net payments for claims:      
Current year 383,639 375,365  
Prior years 2,205,566 2,019,371  
Total 2,589,205 2,394,736  
Foreign currency translation (56,143) 5,929  
Net reserves at end of period 16,460,846 14,968,481 $ 15,661,820
Ceded reserves at end of period 3,106,344 2,951,515  
Gross reserves at end of period $ 19,567,190 $ 17,919,996 $ 18,739,652