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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 806,796 | $ 801,205 | $ 797,666 | $ 789,770 | $ 794,517 | $ 790,850 | $ 779,321 | $ 767,085 | $ 3,195,437 | $ 3,131,773 | $ 2,957,897
Change in fair value of financial instruments pursuant to the fair value option | 28,065 | 17,608 | 20,275 | 21,857 | (67,332) | (21,132) | 37,127 | 18,531 | 87,927 | (32,805) | (61,731)
Income before income taxes | 9,487 | 58,247 | 68,752 | 30,599 | (51,270) | 31,625 | 64,335 | 26,034 | 167,085 | 70,724 | 70,567
Net income | $ 19,779 | $ 46,485 | $ 51,633 | $ 26,980 | $ (26,082) | $ 26,930 | $ 48,873 | $ 23,323 | $ 144,877 | $ 73,044 | $ 74,479
Basic (in dollars per share) | $ 0.36 | $ 0.84 | $ 0.93 | $ 0.49 | $ (0.47) | $ 0.49 | $ 0.88 | $ 0.42 | $ 2.62 | $ 1.32 | $ 1.35
Diluted (in dollars per share) | 0.36 | 0.84 | 0.93 | 0.49 | (0.47) | 0.49 | 0.88 | 0.42 | 2.62 | 1.32 | $ 1.35
Dividends paid per share | $ 0.6250 | $ 0.6225 | $ 0.6225 | $ 0.6225 | $ 0.6225 | $ 0.6200 | $ 0.6200 | $ 0.6200 | $ 0.6250 | $ 0.6225 |

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