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Reserve for Claims and Claim Expenses (Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Reserve for Claims and Claim Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses $ 7,455,128 $ 6,593,052 $ 3,704,050 $ 3,493,778
Reinsurance Recoverable 2,926,010 2,791,297 2,372,221  
Total reserve for claims and claim expenses 10,381,138 9,384,349 $ 6,076,271  
Other        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 508      
Reinsurance Recoverable 200      
Total reserve for claims and claim expenses 708 $ 440    
Property        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 2,936,257      
Reinsurance Recoverable 1,435,488      
Casualty and Specialty        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 4,518,363      
Reinsurance Recoverable $ 1,490,322