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Unaudited Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unaudited Quarterly Financial Data [Abstract]                      
Gross written premiums $ 2,750,548 $ 2,791,604 $ 2,369,338 $ 2,570,871 $ 2,436,327 $ 2,403,274 $ 2,166,655 $ 2,127,108      
Net written premiums 2,449,346 2,448,680 2,017,478 2,201,479 2,120,186 2,068,557 1,783,983 1,851,698 $ 9,116,983 $ 7,824,424 $ 7,414,428
Premiums earned 2,396,483 2,205,811 2,042,405 2,036,814 1,948,071 1,905,619 1,817,299 1,732,697 8,681,513 7,403,686 6,931,699
Net investment income 222,349 234,233 38,083 147,800 146,077 181,058 179,028 140,976 642,465 647,139 581,183
Net realized capital gains (losses) 183,386 110,203 184,648 (210,588) 75,443 (12,943) 30,272 92,232 267,649 185,004 (127,136)
Total claims and underwriting expenses 2,615,223 2,320,417 1,991,462 2,008,222 1,976,943 1,933,158 1,620,413 1,537,009      
Net income (loss) $ 63,601 $ 243,057 $ 190,880 $ 16,612 $ 217,644 $ 104,398 $ 332,868 $ 354,551 $ 514,151 $ 1,009,461 $ 89,041
Basic $ 1.59 $ 6.08 $ 4.78 $ 0.41 $ 5.34 $ 2.56 $ 8.17 $ 8.70 $ 12.81 $ 24.77 $ 2.18
Diluted $ 1.59 $ 6.07 $ 4.77 $ 0.41 $ 5.32 $ 2.56 $ 8.15 $ 8.67 $ 12.78 $ 24.70 $ 2.17