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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
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
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  
Net incurred related to:      
Current year 876,083 557,054  
Prior years (9,032) 13,900  
Total net incurred 867,051 570,954  
Net paid related to:      
Current year 14,751 31,201  
Prior years 486,488 436,286  
Total net paid 501,239 467,487  
Foreign exchange (28,224) (55,395)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 7,792,716 6,641,124  
Reinsurance recoverable 3,160,667 2,765,583 $ 2,926,010
Reserve for claims and claim expenses as of end of period $ 10,953,383 $ 9,406,707