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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses $ 9,025,961 $ 7,455,128 $ 6,593,052 $ 3,704,050
Reinsurance Recoverable 4,268,669 2,926,010 2,791,297  
Total reserve for claims and claim expenses 13,294,630 $ 10,381,138 $ 9,384,349  
Other        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 0      
Reinsurance Recoverable 0      
Property        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 3,829,192      
Reinsurance Recoverable 2,548,496      
Casualty and Specialty        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 5,196,769      
Reinsurance Recoverable $ 1,720,173