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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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 $ 995,907 $ 664,967 2,078,639 1,349,448  
Prior years (53,877) (10,447) (55,383) (14,520)  
Total net incurred 942,030 654,520 2,023,256 1,334,928  
Net paid related to:          
Current year     191,213 128,471  
Prior years     1,293,014 563,539  
Total net paid     1,484,227 692,010  
Foreign exchange     39,904 (41,605)  
Amounts disposed of     (155,178) 0  
Amounts acquired     0 1,858,775  
Net reserves as of end of period 7,016,807 6,164,138 7,016,807 6,164,138  
Reinsurance recoverable 2,883,808 2,438,299 2,883,808 2,438,299 $ 2,791,297
Gross reserves as of end of period $ 9,900,615 $ 8,602,437 $ 9,900,615 $ 8,602,437