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Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | Quarterly Financial Information
(unaudited, $ in thousands, |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
except per share data) |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Net premiums earned |  | $ | 476,123 |  |  | 456,495 |  |  | 490,309 |  |  | 463,625 |  |  | 507,390 |  |  | 462,639 |  |  | 516,087 |  |  | 469,850 |
Net investment income earned |  | 26,917 |  |  | 35,534 |  |  | 32,230 |  |  | 36,774 |  |  | 32,061 |  |  | 34,292 |  |  | 30,108 |  |  | 32,108 |
Net realized gains (losses) |  | 18,883 |  |  | 7,218 |  |  | (3,420 | ) |  | 4,539 |  |  | 308 |  |  | 15,231 |  |  | (2,600 | ) |  | (389 | )
Underwriting income (loss) |  | 26,021 |  |  | (5,015 | ) |  | 29,124 |  |  | 10,084 |  |  | 44,831 |  |  | 34,437 |  |  | 49,053 |  |  | 38,637 |
Net income |  | 39,708 |  |  | 17,974 |  |  | 33,768 |  |  | 29,341 |  |  | 46,996 |  |  | 53,162 |  |  | 45,389 |  |  | 41,350 |
Other comprehensive income (loss) |  | 3,827 |  |  | 16,678 |  |  | (35,944 | ) |  | 26,483 |  |  | 6,290 |  |  | (18,887 | ) |  | (3,386 | ) |  | (29,337 | )
Comprehensive income (loss) |  | 43,535 |  |  | 34,652 |  |  | (2,176 | ) |  | 55,824 |  |  | 53,286 |  |  | 34,275 |  |  | 42,003 |  |  | 12,013 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 0.70 |  |  | 0.32 |  |  | 0.59 |  |  | 0.52 |  |  | 0.82 |  |  | 0.94 |  |  | 0.79 |  |  | 0.73 |
Diluted |  | 0.69 |  |  | 0.31 |  |  | 0.58 |  |  | 0.51 |  |  | 0.81 |  |  | 0.93 |  |  | 0.78 |  |  | 0.72 |
Dividends to stockholders 1 |  | 0.14 |  |  | 0.13 |  |  | 0.14 |  |  | 0.13 |  |  | 0.14 |  |  | 0.13 |  |  | 0.15 |  |  | 0.14 |
Price range of common stock:2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | 30.10 |  |  | 26.99 |  |  | 29.60 |  |  | 25.42 |  |  | 32.50 |  |  | 25.46 |  |  | 37.91 |  |  | 27.65 |
Low |  | 25.49 |  |  | 21.38 |  |  | 26.28 |  |  | 22.14 |  |  | 28.10 |  |  | 21.97 |  |  | 30.36 |  |  | 22.01 |
The addition of all quarters may not agree to annual amounts on the Financial Statements due to rounding. 1 See Note 19. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions. 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 4, 2016 and ending February 12, 2016 was $29.27 to $34.00.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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