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Non-life Reserves - Components of Non-life reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components of non-life reserves [Line Items]        
Non-life reserves [1] $ 13,151,309 $ 12,725,631    
Non Life        
Components of non-life reserves [Line Items]        
Case reserves 5,148,325 5,110,575    
ACRs 190,071 159,821    
IBNR reserves 7,812,913 7,455,235    
Non-life reserves $ 13,151,309 $ 12,725,631 $ 12,047,792 $ 11,395,321
[1] See Note 21 for additional information regarding related party transactions.