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Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 2,699,023 $ 1,463,713  
Additional Case Reserves 1,719,448 1,425,184  
IBNR 3,973,013 3,187,374  
Gross reserve for claims and claim expenses 8,391,484 6,076,271 $ 4,912,727
Other      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,404 1,458  
Additional Case Reserves 0 0  
IBNR 3,166 3,166  
Gross reserve for claims and claim expenses 4,570 4,624  
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,243,455 690,718  
Additional Case Reserves 1,598,283 1,308,307  
IBNR 844,681 1,087,229  
Gross reserve for claims and claim expenses 3,686,419 3,086,254  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,454,164 771,537  
Additional Case Reserves 121,165 116,877  
IBNR 3,125,166 2,096,979  
Gross reserve for claims and claim expenses 4,700,495 $ 2,985,393  
TMR Group Entities      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Gross reserve for claims and claim expenses $ 2,400,000