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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Effects of Reinsurance [Line Items]        
Direct premiums written $ 3,109,910 $ 2,773,449 $ 5,652,484 $ 5,293,678
Direct premiums earned 2,674,886 2,379,794 5,287,875 4,777,369
Assumed premiums written 678,275 506,600 1,571,713 1,384,658
Assumed premiums earned 583,479 447,992 1,056,915 899,919
Ceded premiums written (1,580,492) (1,180,254) (2,798,726) (2,413,807)
Ceded premiums earned (1,227,222) (994,682) (2,345,943) (2,084,414)
Net premiums written 2,207,693 2,099,795 4,425,471 4,264,529
Net premiums earned 2,031,143 1,833,104 3,998,847 3,592,874
Underwriting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 2,285,739 2,108,859 4,255,102 3,932,114
Direct premiums earned 2,025,324 1,772,695 3,997,200 3,470,665
Assumed premiums written 448,837 420,026 1,137,732 1,116,386
Assumed premiums earned 424,404 382,876 823,123 785,943
Ceded premiums written (526,562) (427,959) (966,591) (781,341)
Ceded premiums earned (418,264) (321,438) (820,704) (661,367)
Net premiums written 2,208,014 2,100,926 4,426,243 4,267,159
Net premiums earned 2,031,464 1,834,133 3,999,619 3,595,241
Program services and other fronting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 824,171 664,590 1,397,382 1,361,564
Direct premiums earned 649,562 607,099 1,290,675 1,306,704
Assumed premiums written 229,438 86,574 433,981 268,272
Assumed premiums earned 159,075 65,116 233,792 113,976
Ceded premiums written (1,053,930) (752,295) (1,832,135) (1,632,466)
Ceded premiums earned (808,958) (673,244) (1,525,239) (1,423,047)
Net premiums written (321) (1,131) (772) (2,630)
Net premiums earned $ (321) $ (1,029) $ (772) $ (2,367)