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Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2016
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) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Net premiums earned |  | $ | 522,458 |  |  | 476,123 |  |  | 531,932 |  |  | 490,309 |  |  | 542,429 |  |  | 507,390 |  |  | 552,753 |  |  | 516,087 |
Net investment income earned |  | 30,769 |  |  | 26,917 |  |  | 31,182 |  |  | 32,230 |  |  | 33,375 |  |  | 32,061 |  |  | 35,428 |  |  | 30,108 |
Net realized (losses) gains |  | (2,704 | ) |  | 18,883 |  |  | 1,765 |  |  | (3,420 | ) |  | 3,688 |  |  | 308 |  |  | (7,686 | ) |  | (2,600 | )
Underwriting income |  | 40,955 |  |  | 26,021 |  |  | 43,777 |  |  | 29,124 |  |  | 32,033 |  |  | 44,831 |  |  | 35,168 |  |  | 49,053 |
Net income |  | 37,032 |  |  | 39,708 |  |  | 43,601 |  |  | 33,768 |  |  | 38,502 |  |  | 46,996 |  |  | 39,360 |  |  | 45,389 |
Other comprehensive income (loss) |  | 45,422 |  |  | 3,827 |  |  | 36,010 |  |  | (35,944 | ) |  | (9,798 | ) |  | 6,290 |  |  | (78,159 | ) |  | (3,386 | )
Comprehensive income (loss) |  | 82,454 |  |  | 43,535 |  |  | 79,611 |  |  | (2,176 | ) |  | 28,704 |  |  | 53,286 |  |  | (38,799 | ) |  | 42,003 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 0.64 |  |  | 0.70 |  |  | 0.75 |  |  | 0.59 |  |  | 0.66 |  |  | 0.82 |  |  | 0.68 |  |  | 0.79 |
Diluted |  | 0.63 |  |  | 0.69 |  |  | 0.74 |  |  | 0.58 |  |  | 0.66 |  |  | 0.81 |  |  | 0.67 |  |  | 0.78 |
Dividends to stockholders 1 |  | 0.15 |  |  | 0.14 |  |  | 0.15 |  |  | 0.14 |  |  | 0.15 |  |  | 0.14 |  |  | 0.16 |  |  | 0.15 |
Price range of common stock:2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | 36.92 |  |  | 30.10 |  |  | 38.67 |  |  | 29.60 |  |  | 41.30 |  |  | 32.50 |  |  | 44.00 |  |  | 37.91 |
Low |  | 29.27 |  |  | 25.49 |  |  | 33.60 |  |  | 26.28 |  |  | 35.90 |  |  | 28.10 |  |  | 34.95 |  |  | 30.36 |
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 3, 2017 and ending February 14, 2017 was $38.50 to $44.35.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: 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=68064558&loc=d3e765-108305 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=68064558&loc=d3e725-108305 + Details
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