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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. 14, 2014 | 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
Net premiums earned |  | $ 451,312 |  | $ 437,568 |  | $ 426,252 |  | $ 420,940 |  | $ 406,853 |  | $ 406,225 |  | $ 392,212 |  | $ 378,829 |  | $ 1,736,072 | $ 1,584,119 | $ 1,439,313
Net investment income |  | 35,313 |  | 32,457 |  | 34,003 |  | 32,870 |  | 34,593 |  | 30,650 |  | 34,006 |  | 32,628 |  | 134,643 | 131,877 | 147,443
Net realized gains (losses) |  | (1,208) |  | 13,431 |  | 5,154 |  | 3,355 |  | 5,540 |  | (1,088) |  | 178 |  | 4,358 |  | 26,375 | 13,252 | 15,426
Underwriting gain (loss), before federal income tax |  | 11,971 |  | 10,151 |  | 4,483 |  | 12,161 |  | (36,543) |  | 861 |  | (26,962) |  | (1,363) |  |  |  |
Net income from continuing operations |  | 25,335 |  | 32,653 |  | 27,122 |  | 22,305 |  | 1,308 |  | 18,274 |  | 288 |  | 18,093 |  | 107,415 | 37,963 | 22,683
Loss on disposal of discontinued operations, net of tax |  | 0 |  | 0 |  | 0 |  | (997) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Net income |  | 25,335 |  | 32,653 |  | 27,122 |  | 21,308 |  | 1,308 |  | 18,274 |  | 288 |  | 18,093 |  | 106,418 | 37,963 | 22,033
Other comprehensive income (loss) |  | 7,768 |  | (2,195) |  | (62,643) |  | 27,881 |  | (30,971) |  | 26,507 |  | 5,520 |  | 10,690 |  |  |  |
Total Comprehensive income (loss) |  | 33,103 |  | 30,458 |  | (35,521) |  | 49,189 |  | (29,663) |  | 44,781 |  | 5,808 |  | 28,783 |  | 77,229 | 49,709 | 57,303
Basic net income per share |  | $ 0.45 |  | $ 0.59 |  | $ 0.49 |  | $ 0.38 |  | $ 0.02 |  | $ 0.33 |  | $ 0.01 |  | $ 0.33 |  | $ 1.91 | $ 0.69 | $ 0.41
Diluted net income per share |  | $ 0.44 |  | $ 0.57 |  | $ 0.48 |  | $ 0.38 |  | $ 0.02 |  | $ 0.33 |  | $ 0.01 |  | $ 0.33 |  | $ 1.87 | $ 0.68 | $ 0.40
Dividends to stockholders |  | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.52 | $ 0.52 | $ 0.52
Price range common stock, high | 26.99 | 28.31 | [2] | 25.95 | [2] | 24.75 | [2] | 24.13 | [2] | 20.31 | [2] | 19.37 | [2] | 17.99 | [2] | 19.00 | [2] |  |  |
Price range of common stock, low | 21.38 | 23.55 | [2] | 22.61 | [2] | 19.58 | [2] | 19.53 | [2] | 17.17 | [2] | 16.64 | [2] | 16.22 | [2] | 16.64 | [2] |  |  |
Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (29,189) | $ 11,746 | $ 35,270
[1] | 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.
[2] | 2 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 2, 2014 and ending February 14, 2014 was $21.38 to $26.99.

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