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Reserve for Claims and Claim Expenses (Schedule of Claims and Claim Expense Reserves by Segment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 3,339,544 $ 2,779,059  
Additional Case Reserves 2,124,825 1,750,846  
IBNR 7,830,261 5,851,233  
Net reserve for claims and claim expenses 13,294,630 10,381,138 $ 9,384,349
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,555,210 1,127,909  
Additional Case Reserves 1,996,760 1,617,003  
IBNR 2,825,718 1,627,541  
Net reserve for claims and claim expenses 6,377,688 4,372,453  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,784,334 1,651,150  
Additional Case Reserves 128,065 133,843  
IBNR 5,004,543 4,223,692  
Net reserve for claims and claim expenses $ 6,916,942 $ 6,008,685