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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Effects of Reinsurance [Line Items]      
Direct premiums written $ 12,094,040 $ 11,306,483 $ 10,729,950
Direct premiums earned 11,855,424 10,999,889 10,068,570
Assumed premiums written 3,400,591 2,695,754 2,471,732
Assumed premiums earned 3,188,007 2,554,030 2,246,805
Ceded premiums written (7,198,456) (5,604,662) (4,998,292)
Ceded premiums earned (6,611,019) (5,258,440) (4,727,583)
Net premiums written 8,296,175 8,397,575 8,203,390
Net premiums earned 8,432,412 8,295,479 7,587,792
Underwriting [Member]      
Effects of Reinsurance [Line Items]      
Direct premiums written 8,860,015 8,657,266 8,085,812
Direct premiums earned 8,801,477 8,363,710 7,379,766
Assumed premiums written 1,691,858 1,620,366 1,761,726
Assumed premiums earned 1,628,408 1,616,630 1,589,920
Ceded premiums written (2,252,122) (1,878,844) (1,640,165)
Ceded premiums earned (1,993,895) (1,683,648) (1,378,191)
Net premiums written 8,299,751 8,398,788 8,207,373
Net premiums earned 8,435,990 8,296,692 7,591,495
Fronting [Member]      
Effects of Reinsurance [Line Items]      
Direct premiums written 3,234,025 2,649,217 2,644,138
Direct premiums earned 3,053,947 2,636,179 2,688,804
Assumed premiums written 1,708,733 1,075,388 710,006
Assumed premiums earned 1,559,599 937,400 656,885
Ceded premiums written (4,946,334) (3,725,818) (3,358,127)
Ceded premiums earned (4,617,124) (3,574,792) (3,349,392)
Net premiums written (3,576) (1,213) (3,983)
Net premiums earned $ (3,578) $ (1,213) $ (3,703)