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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

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