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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Net reserves as of beginning of period     $ 6,593,052 $ 3,704,050  
Net incurred related to:          
Current year $ 525,678 $ 453,140 1,082,732 684,481  
Prior years (15,406) 233 (1,506) (4,073)  
Total net incurred 510,272 453,373 1,081,226 680,408  
Net paid related to:          
Current year     61,625 52,332  
Prior years     1,007,916 570,561  
Total net paid     1,069,541 622,893  
Foreign exchange     (13,626) (642)  
Amounts acquired     0 1,858,775  
Net reserves as of end of period 6,591,111 5,619,698 6,591,111 5,619,698  
Reinsurance recoverable 2,774,358 2,865,150 2,774,358 2,865,150 $ 2,791,297
Gross reserves as of end of period $ 9,365,469 $ 8,484,848 $ 9,365,469 $ 8,484,848