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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effects of Reinsurance [Line Items]      
Direct premiums written $ 11,306,483 $ 10,729,950 $ 9,508,184
Direct premiums earned 10,999,889 10,068,570 8,729,068
Assumed premiums written 2,695,754 2,471,732 1,930,498
Assumed premiums earned 2,554,030 2,246,805 1,744,346
Ceded premiums written (5,604,662) (4,998,292) (4,318,951)
Ceded premiums earned (5,258,440) (4,727,583) (3,970,385)
Net premiums written 8,397,575 8,203,390 7,119,731
Net premiums earned 8,295,479 7,587,792 6,503,029
Underwriting [Member]      
Effects of Reinsurance [Line Items]      
Direct premiums written 8,657,266 8,085,812 6,863,229
Direct premiums earned 8,363,710 7,379,766 6,275,078
Assumed premiums written 1,620,366 1,761,726 1,622,700
Assumed premiums earned 1,616,630 1,589,920 1,482,755
Ceded premiums written (1,878,844) (1,640,165) (1,360,763)
Ceded premiums earned (1,683,648) (1,378,191) (1,250,392)
Net premiums written 8,398,788 8,207,373 7,125,166
Net premiums earned 8,296,692 7,591,495 6,507,441
Program services and other fronting [Member]      
Effects of Reinsurance [Line Items]      
Direct premiums written 2,649,217 2,644,138 2,644,955
Direct premiums earned 2,636,179 2,688,804 2,453,990
Assumed premiums written 1,075,388 710,006 307,798
Assumed premiums earned 937,400 656,885 261,591
Ceded premiums written (3,725,818) (3,358,127) (2,958,188)
Ceded premiums earned (3,574,792) (3,349,392) (2,719,993)
Net premiums written (1,213) (3,983) (5,435)
Net premiums earned $ (1,213) $ (3,703) $ (4,412)