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Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 3,519,873 $ 3,339,544  
Additional Case Reserves 2,083,711 2,124,825  
IBNR 7,906,720 7,830,261  
Gross reserve for claims and claim expenses 13,510,304 13,294,630 $ 10,953,383
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,679,877 1,555,210  
Additional Case Reserves 1,956,369 1,996,760  
IBNR 2,597,013 2,825,718  
Gross reserve for claims and claim expenses 6,233,259 6,377,688  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,839,996 1,784,334  
Additional Case Reserves 127,342 128,065  
IBNR 5,309,707 5,004,543  
Gross reserve for claims and claim expenses $ 7,277,045 $ 6,916,942