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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Effects of Reinsurance [Line Items]        
Direct premiums written $ 3,124,486 $ 3,012,582 $ 9,270,669 $ 9,164,683
Direct premiums earned 3,118,899 2,928,239 9,096,408 8,791,309
Assumed premiums written 734,407 459,127 3,950,945 2,959,555
Assumed premiums earned 1,565,605 935,374 3,016,157 2,106,919
Ceded premiums written (1,620,697) (1,489,573) (6,429,776) (5,631,286)
Ceded premiums earned (2,478,731) (1,753,505) (5,675,727) (4,583,394)
Net premiums written 2,238,196 1,982,136 6,791,838 6,492,952
Net premiums earned 2,205,773 2,110,108 6,436,838 6,314,834
Underwriting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 2,420,107 2,249,500 6,970,879 6,713,503
Direct premiums earned 2,275,753 2,206,453 6,681,520 6,554,464
Assumed premiums written 382,313 282,089 1,583,225 1,515,639
Assumed premiums earned 453,405 404,686 1,342,521 1,212,116
Ceded premiums written (563,681) (549,264) (1,761,973) (1,735,668)
Ceded premiums earned (522,939) (500,842) (1,587,018) (1,451,224)
Net premiums written 2,238,739 1,982,325 6,792,131 6,493,474
Net premiums earned 2,206,219 2,110,297 6,437,023 6,315,356
Fronting        
Effects of Reinsurance [Line Items]        
Direct premiums written 704,379 763,082 2,299,790 2,451,180
Direct premiums earned 843,146 721,786 2,414,888 2,236,845
Assumed premiums written 352,094 177,038 2,367,720 1,443,916
Assumed premiums earned 1,112,200 530,688 1,673,636 894,803
Ceded premiums written (1,057,016) (940,309) (4,667,803) (3,895,618)
Ceded premiums earned (1,955,792) (1,252,663) (4,088,709) (3,132,170)
Net premiums written (543) (189) (293) (522)
Net premiums earned $ (446) $ (189) $ (185) $ (522)