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Quarterly Financial Information (Unaudited) (Summary Of Quarterly Financial Information) (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
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 921,860 | $ 899,304 | $ 811,897 | $ 922,574 | $ 925,384 | $ 915,012 | $ 888,776 | $ 870,245 | $ 3,555,635 | $ 3,599,418 | $ 3,368,411
Change in fair value of financial instruments pursuant to the fair value option | 87,968 | 58,865 | 166,829 | (240,990) | 18,173 | 24,021 | 50,281 | 104,227 |  |  |
(Loss) income before income taxes | 207,110 | 146,631 | 285,466 | (180,705) | 28,465 | 80,840 | 101,595 | 167,169 | 458,501 | 378,069 | (30,615)
Net income (loss) | $ 166,743 | $ 118,857 | $ 228,211 | $ (139,204) | $ 31,688 | $ 69,282 | $ 83,250 | $ 135,867 | $ 374,607 | $ 320,087 | $ (5,728)
Basic (loss) earnings per share (in dollars per share) | $ 3.01 | $ 2.15 | $ 4.12 | $ (2.51) | $ 0.57 | $ 1.25 | $ 1.50 | $ 2.46 | $ 6.77 | $ 5.78 | $ (0.10)
Diluted (loss) earnings per share (in dollars per share) | 3.01 | 2.15 | 4.12 | (2.51) | 0.57 | 1.25 | 1.50 | 2.45 | 6.77 | 5.78 | $ (0.10)
Dividends paid per share (in dollars per share) | $ 0.6325 | $ 0.6300 | $ 0.6300 | $ 0.6300 | $ 0.6300 | $ 0.6275 | $ 0.6275 | $ 0.6275 | $ 0.6325 | $ 0.6300 |

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