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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 7,455,128 $ 6,593,052 $ 3,704,050
Net incurred related to:      
Current year 4,125,557 3,108,421 2,123,876
Prior years (249,470) (183,812) (26,855)
Total net incurred 3,876,087 2,924,609 2,097,021
Net paid related to:      
Current year 574,230 412,172 265,649
Prior years 1,649,872 1,592,456 832,405
Total net paid 2,224,102 2,004,628 1,098,054
Foreign exchange (81,152) 97,273 31,260
Amounts disposed 0 (155,178) 0
Amounts acquired 0 0 1,858,775
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 9,025,961 7,455,128 6,593,052
Reinsurance recoverable as of end of period 4,268,669 2,926,010 2,791,297
Reserve for claims and claim expenses as of end of period $ 13,294,630 $ 10,381,138 $ 9,384,349