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Unaudited Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unaudited Quarterly Financial Data [Abstract]                            
Gross written premiums $ 2,436,327 $ 2,403,274 $ 2,166,655 $ 2,127,108 $ 2,278,361 $ 2,198,664 $ 2,066,521 $ 1,931,607            
Net written premiums 2,120,186 2,068,557 1,783,983 1,851,698 2,057,071 1,938,773 1,746,378 1,672,206       $ 7,824,424 $ 7,414,428 $ 6,244,661
Premiums earned 1,948,071 1,905,619 1,817,299 1,732,697 1,850,975 1,731,479 1,729,818 1,619,427       7,403,686 6,931,699 5,937,840
Net investment income 146,077 181,058 179,028 140,976 140,204 161,363 141,322 138,294       647,139 581,183 542,898
Net realized capital gains (losses) 75,443 (12,943) 30,272 92,232 (172,815) 54,804 15,776 (24,901)       185,004 (127,136) 153,194
Total claims and underwriting expenses 1,976,943 1,933,158 1,620,413 1,537,009 2,481,858 1,731,201 1,817,815 1,511,100       7,132,182 7,603,677 6,202,887
Net income (loss) $ 217,644 $ 104,398 $ 332,868 $ 354,551 $ (385,313) $ 198,381 $ 60,787 $ 215,186 $ 687,419 $ 275,973 $ 474,354 $ 1,009,461 $ 89,041 $ 482,751
Basic $ 5.34 $ 2.56 $ 8.17 $ 8.70 $ (9.58) $ 4.87 $ 1.49 $ 5.26 $ 16.88 $ 6.75 $ 11.61 $ 24.77 $ 2.18 $ 11.77
Diluted $ 5.32 $ 2.56 $ 8.15 $ 8.67 $ (9.58) $ 4.84 $ 1.48 $ 5.23 $ 16.82 $ 6.71 $ 11.55 $ 24.70 $ 2.17 $ 11.70