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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
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net premiums earned | $ 641,613 | $ 643,626 |  | $ 642,331 | $ 638,487 | $ 640,796 |  | $ 642,558 | $ 642,717 | $ 640,614 |  |  |
Change in fair value of investments pursuant to the fair value option | 54,100 | (64,312) |  | 20,597 | 20,904 | (29,469) |  | 87,647 | (30,537) | 18,939 |  |  |
Income (loss) before income taxes | 110,693 | (18,118) |  | 75,613 | 76,911 | (50,097) |  | 135,839 | 15,358 | 81,290 | 245,099 | 182,390 | 571,541
Net income | 79,469 | (3,782) |  | 57,251 | 58,226 | (23,647) |  | 96,849 | 17,817 | 61,179 | 191,164 | 152,198 | 403,072
Basic earnings per share | $ 1.45 | $ (0.07) |  | $ 1.04 | $ 1.06 | $ (0.43) |  | $ 1.77 | $ 0.33 | $ 1.12 | $ 3.49 | $ 2.78 | $ 7.36
Diluted earnings per share | $ 1.45 | $ (0.07) | [1] | $ 1.04 | $ 1.06 | $ (0.43) | [1] | $ 1.77 | $ 0.32 | $ 1.12 | $ 3.49 | $ 2.78 | $ 7.32
Dividends declared per share | $ 0.61 | $ 0.60 |  | $ 0.60 | $ 0.60 | $ 0.60 |  | $ 0.59 | $ 0.59 | $ 0.59 | $ 0.61 | $ 0.60 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (4,063) | (12,754) | 2,690
Net income |  |  |  |  |  |  |  |  |  |  | $ 191,164 | $ 152,198 | $ 403,072
[1] | The dilutive impact of incremental shares is excluded from loss position in accordance with GAAP.

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