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Reserves for Loss and Loss Expenses (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Net reserves at beginning of period $ 12,848,362 $ 11,620,393  
Net provision for losses and loss expenses:      
Claims occurring during the current year 2,748,725 2,308,309  
Decrease in estimates for claims occurring in prior years 9,765 1,530  
Loss reserve discount accretion 16,579 15,399  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 2,775,069 2,325,238  
Net payments for claims:      
Current year 318,129 279,703  
Prior years 1,688,843 1,485,116  
Total 2,006,972 1,764,819  
Foreign currency translation (94,526) (16,153)  
Net reserves at end of period 13,521,933 12,164,659 $ 12,848,362
Ceded reserves at end of period 2,623,888 2,316,288  
Gross reserves at end of period $ 16,145,821 $ 14,480,947 $ 15,390,888