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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 868,233 | $ 858,135 | $ 833,959 | $ 808,084 | $ 806,796 | $ 801,205 | $ 797,666 | $ 789,770 | $ 3,368,411 | $ 3,195,437 | $ 3,131,773
Change in fair value of financial instruments pursuant to the fair value option | (70,020) | (12,907) | 8,793 | (58,532) | 28,065 | 17,608 | 20,275 | 21,857 | (132,658) | 87,927 | (32,805)
(Loss) income before income taxes | (114,448) | 70,286 | 73,246 | (59,699) | 9,487 | 58,247 | 68,752 | 30,599 | (30,615) | 167,085 | 70,724
Net (loss) income | $ (81,879) | $ 58,578 | $ 60,180 | $ (42,607) | $ 19,779 | $ 46,485 | $ 51,633 | $ 26,980 | $ (5,728) | $ 144,877 | $ 73,044
Basic (loss) earnings per share (in dollars per share) | $ (1.48) | $ 1.06 | $ 1.09 | $ (0.77) | $ 0.36 | $ 0.84 | $ 0.93 | $ 0.49 | $ (0.10) | $ 2.62 | $ 1.32
Diluted (loss) earnings per share (in dollars per share) | (1.48) | 1.06 | 1.09 | (0.77) | 0.36 | 0.84 | 0.93 | 0.49 | (0.10) | 2.62 | $ 1.32
Dividends paid per share (in dollars per share) | $ 0.6275 | $ 0.6250 | $ 0.6250 | $ 0.6250 | $ 0.625 | $ 0.6225 | $ 0.6225 | $ 0.6225 | $ 0.6275 | $ 0.625 |

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