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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Effects of Reinsurance [Line Items]        
Direct premiums written $ 3,299,676 $ 3,109,910 $ 6,152,101 $ 5,652,484
Direct premiums earned 2,961,150 2,674,886 5,863,070 5,287,875
Assumed premiums written 1,412,454 678,275 2,500,428 1,571,713
Assumed premiums earned 655,332 583,479 1,171,545 1,056,915
Ceded premiums written (2,433,351) (1,580,492) (4,141,713) (2,798,726)
Ceded premiums earned (1,539,383) (1,227,222) (2,829,889) (2,345,943)
Net premiums written 2,278,779 2,207,693 4,510,816 4,425,471
Net premiums earned 2,077,099 2,031,143 4,204,726 3,998,847
Underwriting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 2,356,536 2,285,739 4,464,003 4,255,102
Direct premiums earned 2,149,773 2,025,324 4,348,011 3,997,200
Assumed premiums written 564,851 448,837 1,233,550 1,137,732
Assumed premiums earned 414,488 424,404 807,430 823,123
Ceded premiums written (642,448) (526,562) (1,186,404) (966,591)
Ceded premiums earned (487,002) (418,264) (950,382) (820,704)
Net premiums written 2,278,939 2,208,014 4,511,149 4,426,243
Net premiums earned 2,077,259 2,031,464 4,205,059 3,999,619
Program services and other fronting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 943,140 824,171 1,688,098 1,397,382
Direct premiums earned 811,377 649,562 1,515,059 1,290,675
Assumed premiums written 847,603 229,438 1,266,878 433,981
Assumed premiums earned 240,844 159,075 364,115 233,792
Ceded premiums written (1,790,903) (1,053,930) (2,955,309) (1,832,135)
Ceded premiums earned (1,052,381) (808,958) (1,879,507) (1,525,239)
Net premiums written (160) (321) (333) (772)
Net premiums earned $ (160) $ (321) $ (333) $ (772)