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Reserves for Loss and Loss Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 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 1,647,674 1,502,817  
Decrease in estimates for claims occurring in prior years 7,367 28,205  
Loss reserve discount accretion 8,737 7,733  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 1,663,778 1,538,755  
Net payments for claims:      
Current year 107,434 110,274  
Prior years 1,158,864 1,106,481  
Total 1,266,298 1,216,755  
Foreign currency translation (52,944) 1,154  
Net reserves at end of period 16,006,356 14,572,033 $ 15,661,820
Ceded reserves at end of period 3,093,272 2,859,602  
Gross reserves at end of period $ 19,099,628 $ 17,431,635 $ 18,739,652