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Statutory Financial Information (Actual Statutory Capital And Surplus) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
United States [Member]    
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus $ 6,764,770 $ 5,958,801
United Kingdom [Member]    
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus 1,001,574 977,604
Bermuda [Member]    
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus 2,414,364 2,353,058
Germany [Member]    
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus $ 171,581 $ 166,403