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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. 15, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net premiums earned |  | $ 406,853 |  | $ 406,225 |  | $ 392,212 |  | $ 378,829 |  | $ 373,427 |  | $ 358,963 |  | $ 355,580 |  | $ 351,343 |  | $ 1,584,119 | $ 1,439,313 | $ 1,416,598
Net investment income |  | 34,593 |  | 30,650 |  | 34,006 |  | 32,628 |  | 28,839 |  | 35,786 |  | 39,345 |  | 43,473 |  | 131,877 | 147,443 | 145,708
Net realized investment (losses) gains |  | 5,540 |  | (1,088) |  | 178 |  | 4,358 |  | (3,621) |  | (2,045) |  | 2,146 |  | 5,760 |  | 13,252 | 15,426 | 10,575
Underwriting (loss) profit |  | (36,543) |  | 861 |  | (26,962) |  | (1,363) |  | 7,895 |  | (64,779) |  | (34,002) |  | (12,698) |  |  |  |
Net income from continuing operations |  | 1,308 |  | 18,274 |  | 288 |  | 18,093 |  | 18,034 |  | (17,318) |  | 1,467 |  | 20,500 |  | 37,963 | 22,683 | 70,746
Loss from discontinued operations, net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (650) |  | 0 |  | 0 |  |  |  |
Net income |  | 1,308 |  | 18,274 |  | 288 |  | 18,093 |  | 18,034 |  | (17,968) |  | 1,467 |  | 20,500 |  | 37,963 | 22,033 | 66,966
Other comprehensive income (loss) |  | (30,971) |  | 26,507 |  | 5,520 |  | 10,690 |  | 10,130 |  | 11,020 |  | 18,368 |  | (4,248) |  | 11,746 | 35,270 | 19,484
Comprehensive income |  | $ (29,663) |  | $ 44,781 |  | $ 5,808 |  | $ 28,783 |  | $ 28,164 |  | $ (6,948) |  | $ 19,835 |  | $ 16,252 |  | $ 49,709 | $ 57,303 | $ 86,450
Basic net income per share |  | $ 0.02 |  | $ 0.33 |  | $ 0.01 |  | $ 0.33 |  | $ 0.33 |  | $ (0.33) |  | $ 0.03 |  | $ 0.38 |  | $ 0.69 | $ 0.41 | $ 1.26
Diluted net income (loss) per share |  | $ 0.02 |  | $ 0.33 |  | $ 0.01 |  | $ 0.33 |  | $ 0.33 |  | $ (0.33) |  | $ 0.03 |  | $ 0.37 |  | $ 0.68 | $ 0.40 | $ 1.23
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 of common stock, low | 19.53 | 17.17 | [2] | 16.64 | [2] | 16.22 | [2] | 16.64 | [2] | 12.10 | [2] | 12.60 | [2] | 15.32 | [2] | 16.30 | [2] |  |  |
Price range common stock, high | 22.08 | 20.31 | [2] | 19.37 | [2] | 17.99 | [2] | 19.00 | [2] | 18.35 | [2] | 16.96 | [2] | 18.06 | [2] | 18.97 | [2] |  |  |
[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, 2013 and ending February 15, 2013 was $19.53 to $22.08.

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- Definition Premiums recognized as revenue in the period earned on all property and casualty insurance and reinsurance contracts after subtracting any amounts ceded to another insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration