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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 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 $ 572,050 $ 525,678 1,448,133 1,082,732  
Prior years (52,029) (15,406) (61,061) (1,506)  
Total net incurred 520,021 510,272 1,387,072 1,081,226  
Net paid related to:          
Current year     65,278 61,625  
Prior years     995,826 1,007,916  
Total net paid     1,061,104 1,069,541  
Foreign exchange     (23,992) (13,626)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 7,757,104 6,591,111 7,757,104 6,591,111  
Reinsurance recoverable 3,187,638 2,774,358 3,187,638 2,774,358 $ 2,926,010
Reserve for claims and claim expenses as of end of period $ 10,944,742 $ 9,365,469 $ 10,944,742 $ 9,365,469