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Reserve for Claims and Claim Expenses - Schedule of Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period     $ 9,025,961 $ 7,455,128  
Net incurred related to:          
Current year $ 749,196 $ 572,050 1,608,762 1,448,133  
Prior years (42,957) (52,029) (60,790) (61,061)  
Total net incurred 706,239 520,021 1,547,972 1,387,072  
Net paid related to:          
Current year     41,124 65,278  
Prior years     1,129,979 995,826  
Total net paid     1,171,103 1,061,104  
Foreign exchange     (166,483) (23,992)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 9,236,347 7,757,104 9,236,347 7,757,104  
Reinsurance recoverable 4,206,459 3,187,638 4,206,459 3,187,638 $ 4,268,669
Reserve for claims and claim expenses as of end of period $ 13,442,806 $ 10,944,742 $ 13,442,806 $ 10,944,742