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Reserves for Loss and Loss Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Net reserves at beginning of period $ 11,620,393 $ 10,697,998      
Net provision for losses and loss expenses:          
Claims occurring during the current year 1,115,173 1,097,523      
Decrease in estimates for claims occurring in prior years (859) 433      
Loss reserve discount accretion 7,278 9,297      
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 1,121,592 1,107,253      
Net payments for claims:          
Current year 97,586 84,310      
Prior years 794,472 864,064      
Total 892,058 948,374      
Foreign currency translation (14,779) (77,167)      
Net reserves at end of period 11,620,393 10,697,998 $ 11,835,148 $ 11,620,393 $ 10,785,637
Ceded reserves at end of period     2,245,380   1,946,878
Gross reserves at end of period     $ 14,080,528 13,784,430 $ 12,732,515
Cumulative effect adjustment resulting from changes in accounting principles          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Net reserves at beginning of period 0 5,927      
Net payments for claims:          
Net reserves at end of period 0 5,927   0  
Cumulative Effect, Period Of Adoption, Adjusted Balance          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Net reserves at beginning of period 11,620,393 10,703,925      
Net payments for claims:          
Net reserves at end of period $ 11,620,393 $ 10,703,925   $ 11,620,393