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Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 17, 2012 | 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
Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  | $ 373,427 |  | $ 358,963 |  | $ 355,580 |  | $ 351,343 |  | $ 353,497 |  | $ 354,709 |  | $ 352,190 |  | $ 356,202 |  | $ 1,439,313 | $ 1,416,598 | $ 1,431,047
Net investment income earned |  | 28,839 |  | 35,786 |  | 39,345 |  | 43,473 |  | 41,471 |  | 32,986 |  | 36,545 |  | 34,706 |  | 147,443 | 145,708 | 118,471
Net realized investment (losses) gains |  | (3,621) |  | (2,045) |  | 2,146 |  | 5,760 |  | (3,812) |  | 57 |  | (3,264) |  | (64) |  | 15,426 | 10,575 | 9,446
Underwriting (loss) profit |  | 4,971 |  | (68,124) |  | (32,682) |  | (11,084) |  | (468) |  | (3,933) |  | (3,161) |  | (14,605) |  | (106,919) | (22,167) | 2,385
Net income (loss) from continuing operations |  | 16,133 | [1] | (19,492) | [1] | 2,325 | [1] | 21,549 | [1] | 23,806 | [1] | 18,831 | [1] | 20,091 | [1] | 6,593 | [1] | 20,515 | 69,321 | 44,658
Loss from discontinued operations, net of tax |  | 0 | [1] | (650) | [1] | 0 | [1] | 0 | [1] | (31) | [1] | (1,634) | [1] | (1,325) | [1] | (790) | [1] | (650) | (3,780) | (8,260)
Net income |  | 16,133 |  | (20,142) |  | 2,325 |  | 21,549 |  | 23,775 |  | 17,197 |  | 18,766 |  | 5,803 |  | 19,865 | 65,541 | 36,398
Other comprehensive income (loss) |  | 10,130 |  | 11,020 |  | 18,368 |  | (4,248) |  | (41,196) |  | 30,394 |  | 23,599 |  | 6,687 |  |  |  |
Comprehensive income, Net |  | $ 26,263 |  | $ (9,122) |  | $ 20,693 |  | $ 17,301 |  | $ (17,421) |  | $ 47,591 |  | $ 42,365 |  | $ 12,490 |  | $ 55,135 | $ 85,025 | $ 126,984
Basic net income per share |  | $ 0.30 |  | $ (0.37) |  | $ 0.04 |  | $ 0.40 |  | $ 0.44 |  | $ 0.32 |  | $ 0.35 |  | $ 0.11 |  | $ 0.37 | $ 1.23 | $ 0.69
Diluted net income per share |  | $ 0.29 |  | $ (0.37) |  | $ 0.04 |  | $ 0.39 |  | $ 0.43 |  | $ 0.32 |  | $ 0.35 |  | $ 0.11 |  | $ 0.36 | $ 1.20 | $ 0.68
Dividends to stockholders |  | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.13 | [2] | $ 0.52 | $ 0.52 | $ 0.52
Price range of common stock, high | 19.00 | 18.35 | [3] | 16.96 | [3] | 18.06 | [3] | 18.97 | [3] | 18.94 | [3] | 16.63 | [3] | 17.28 | [3] | 17.04 | [3] |  |  |
Price range of common stock, low | 17.25 | 12.10 | [3] | 12.60 | [3] | 15.32 | [3] | 16.30 | [3] | 15.97 | [3] | 14.13 | [3] | 14.17 | [3] | 15.01 | [3] |  |  |
[1] | 1 See Note 12. "Discontinued Operations" for a discussion of discontinued operations.
[2] | 2 See Note 10. "Indebtedness" for a discussion of dividend restrictions.
[3] | 3 These ranges of high and low prices of the Parent's common stock, as reported by the NASDAQ Global Select Market, represent actual transactions. Price quotations do not include retail markups, markdowns, and commissions. The range of high and low prices for common stock for the period beginning January 3, 2012 and ending February 17, 2012 was $19.00 to $17.25.

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