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Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2017
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) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 1 |  | 2016
Net premiums earned |  | $ | 560,854 |  |  | 522,458 |  |  | 568,030 |  |  | 531,932 |  |  | 572,055 |  |  | 542,429 |  |  | 590,088 |  |  | 552,753 |
Net investment income earned |  | 37,419 |  |  | 30,769 |  |  | 41,430 |  |  | 31,182 |  |  | 40,446 |  |  | 33,375 |  |  | 42,587 |  |  | 35,428 |
Net realized (losses) gains |  | (1,045 | ) |  | (2,704 | ) |  | 1,734 |  |  | 1,765 |  |  | 6,798 |  |  | 3,688 |  |  | (1,128 | ) |  | (7,686 | )
Other income |  | 3,241 |  |  | 951 |  |  | 3,291 |  |  | 3,868 |  |  | 1,994 |  |  | 2,199 |  |  | 2,190 |  |  | 1,863 |
Total revenues |  | 600,469 |  |  | 551,474 |  |  | 614,485 |  |  | 568,747 |  |  | 621,293 |  |  | 581,691 |  |  | 633,737 |  |  | 582,358 |
Income before federal income taxes |  | 67,574 |  |  | 51,875 |  |  | 58,929 |  |  | 62,311 |  |  | 67,315 |  |  | 55,443 |  |  | 68,150 |  |  | 50,326 |
Net income |  | 50,440 |  |  | 37,032 |  |  | 41,426 |  |  | 43,601 |  |  | 46,718 |  |  | 38,502 |  |  | 30,242 |  |  | 39,360 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 0.87 |  |  | 0.64 |  |  | 0.71 |  |  | 0.75 |  |  | 0.80 |  |  | 0.66 |  |  | 0.52 |  |  | 0.68 |
Diluted |  | 0.85 |  |  | 0.63 |  |  | 0.70 |  |  | 0.74 |  |  | 0.79 |  |  | 0.66 |  |  | 0.51 |  |  | 0.67 |
1 Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information. The addition of all quarters may not agree to annual amounts on the Financial Statements due to rounding.

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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 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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