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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 794,517 | $ 790,850 | $ 779,321 | $ 767,085 | $ 760,094 | $ 745,520 | $ 731,546 | $ 720,737 | $ 3,131,773 | $ 2,957,897 | $ 2,796,195
Change in fair value of investments pursuant to the fair value option | (67,332) | (21,132) | 37,127 | 18,531 | 2,474 | (18,538) | (40,783) | (4,884) | (32,805) | (61,731) | 43,759
Income before income taxes | (51,270) | 31,625 | 64,335 | 26,034 | 23,930 | 12,267 | 4,511 | 29,859 | 70,724 | 70,567 | 247,425
Net income | $ (26,082) | $ 26,930 | $ 48,873 | $ 23,323 | $ 23,405 | $ 15,270 | $ 9,639 | $ 26,165 | $ 73,044 | $ 74,479 | $ 177,949
Basic (in dollars per share) | $ (0.47) | $ 0.49 | $ 0.88 | $ 0.42 | $ 0.42 | $ 0.28 | $ 0.17 | $ 0.47 | $ 1.32 | $ 1.35 | $ 3.23
Diluted (in dollars per share) | (0.47) | 0.49 | 0.88 | 0.42 | 0.42 | 0.28 | 0.17 | 0.47 | 1.32 | 1.35 | $ 3.23
Dividends paid per share | $ 0.6225 | $ 0.6200 | $ 0.6200 | $ 0.62 | $ 0.62 | $ 0.6175 | $ 0.6175 | $ 0.6175 | $ 0.6225 | $ 0.62 |

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