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Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 2,778,142 $ 2,850,272  
Additional Case Reserves 1,777,832 1,760,943  
IBNR 4,809,495 4,773,134  
Gross reserve for claims and claim expenses 9,365,469 9,384,349 $ 8,484,848
Other      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 332 440  
Additional Case Reserves 0 0  
IBNR 0 0  
Gross reserve for claims and claim expenses 332 440  
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,095,511 1,253,406  
Additional Case Reserves 1,650,244 1,631,223  
IBNR 842,395 1,189,221  
Gross reserve for claims and claim expenses 3,588,150 4,073,850  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,682,299 1,596,426  
Additional Case Reserves 127,588 129,720  
IBNR 3,967,100 3,583,913  
Gross reserve for claims and claim expenses $ 5,776,987 $ 5,310,059