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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 6,593,052 $ 3,704,050 $ 3,493,778
Net incurred related to:      
Current year 3,108,421 2,123,876 1,390,767
Prior years (183,812) (26,855) (270,749)
Total net incurred 2,924,609 2,097,021 1,120,018
Net paid related to:      
Current year 412,172 265,649 391,061
Prior years 1,592,456 832,405 503,708
Total net paid 2,004,628 1,098,054 894,769
Foreign exchange 97,273 31,260 (14,977)
Amounts disposed (155,178) 0 0
Amounts acquired 0 1,858,775 0
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 7,455,128 6,593,052 3,704,050
Reinsurance recoverable as of end of period 2,926,010 2,791,297 2,372,221
Reserve for claims and claim expenses as of end of period $ 10,381,138 $ 9,384,349 $ 6,076,271