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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Effects of Reinsurance [Line Items]        
Direct premiums written $ 2,839,412 $ 2,797,453 $ 8,491,896 $ 8,091,131
Direct premiums earned 2,796,788 2,629,128 8,084,663 7,406,497
Assumed premiums written 839,394 677,318 2,411,107 2,061,976
Assumed premiums earned 737,699 627,000 1,794,614 1,526,919
Ceded premiums written (1,651,001) (1,465,604) (4,449,727) (3,879,411)
Ceded premiums earned (1,412,742) (1,299,298) (3,758,685) (3,383,712)
Net premiums written 2,027,805 2,009,167 6,453,276 6,273,696
Net premiums earned 2,121,745 1,956,830 6,120,592 5,549,704
Underwriting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 2,223,988 2,133,822 6,479,090 6,065,936
Direct premiums earned 2,127,244 1,899,816 6,124,444 5,370,481
Assumed premiums written 282,070 349,650 1,419,802 1,466,036
Assumed premiums earned 424,620 408,561 1,247,743 1,194,504
Ceded premiums written (478,035) (473,885) (1,444,626) (1,255,226)
Ceded premiums earned (429,901) (351,118) (1,250,605) (1,012,485)
Net premiums written 2,028,023 2,009,587 6,454,266 6,276,746
Net premiums earned 2,121,963 1,957,259 6,121,582 5,552,500
Program services and other fronting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 615,424 663,631 2,012,806 2,025,195
Direct premiums earned 669,544 729,312 1,960,219 2,036,016
Assumed premiums written 557,324 327,668 991,305 595,940
Assumed premiums earned 313,079 218,439 546,871 332,415
Ceded premiums written (1,172,966) (991,719) (3,005,101) (2,624,185)
Ceded premiums earned (982,841) (948,180) (2,508,080) (2,371,227)
Net premiums written (218) (420) (990) (3,050)
Net premiums earned $ (218) $ (429) $ (990) $ (2,796)