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Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 680,892 | $ 678,913 | $ 675,787 |  | $ 662,595 | $ 655,777 | $ 646,084 |  | $ 637,247 | $ 635,812 | $ 2,698,187 | $ 2,574,920 | $ 2,566,057
Change in fair value of investments pursuant to the fair value option | (30,593) | 21,815 | (78,726) |  | 43,467 | (28,944) | 44,783 |  | (24,788) | 49,343 | (44,037) | 45,509 | 31,289
Income (loss) before income taxes | 11,268 | 54,793 | (24,959) |  | 90,994 | (39,161) | 91,330 |  | (18,853) | 101,994 | 132,096 | 135,310 | 245,099
Net income | $ 15,376 | $ 39,570 | $ (9,264) |  | $ 66,461 | $ (17,382) | $ 66,201 |  | $ (5,264) | $ 73,356 | $ 112,143 | $ 116,911 | $ 191,164
Basic (in dollars per share) | $ 0.28 | $ 0.72 | $ (0.17) |  | $ 1.21 | $ (0.32) | $ 1.21 |  | $ (0.10) | $ 1.34 | $ 2.04 | $ 2.13 | $ 3.49
Diluted (in dollars per share) | $ 0.28 | $ 0.72 | $ (0.17) | [1] | $ 1.21 | $ (0.32) | $ 1.21 | [1] | $ (0.10) | $ 1.34 | $ 2.04 | $ 2.13 | $ 3.49
Dividends paid per share | $ 0.6150 | $ 0.6125 | $ 0.6125 |  | $ 0.6125 | $ 0.6125 | $ 0.61 |  | $ 0.61 | $ 0.61 | $ 0.6150 | $ 0.6125 |
[1] | The dilutive impact of incremental shares is excluded from net loss position in accordance with GAAP.

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