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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
(unaudited, $ in thousands, except per share data) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Net premiums earned |  | $ | 632,573 |  |  | 591,828 |  |  | 642,619 |  |  | 604,836 |  |  | 653,620 |  |  | 614,277 |  |  | 668,359 |  |  | 625,288 |
Net investment income earned |  | 50,618 |  |  | 43,231 |  |  | 58,505 |  |  | 45,553 |  |  | 55,826 |  |  | 52,443 |  |  | 57,594 |  |  | 54,109 |
Net realized and unrealized gains (losses) |  | 13,451 |  |  | (10,549 | ) |  | 4,027 |  |  | (1,652 | ) |  | (2,183 | ) |  | (4,787 | ) |  | (873 | ) |  | (37,935 | )
Other income |  | 2,320 |  |  | 2,179 |  |  | 3,053 |  |  | 3,179 |  |  | 3,162 |  |  | 2,538 |  |  | 3,820 |  |  | 1,542 |
Total revenues |  | 698,962 |  |  | 626,689 |  |  | 708,204 |  |  | 651,916 |  |  | 710,425 |  |  | 664,471 |  |  | 728,900 |  |  | 643,004 |
Income before federal income taxes |  | 73,694 |  |  | 19,931 |  |  | 90,225 |  |  | 72,525 |  |  | 71,178 |  |  | 67,130 |  |  | 101,293 |  |  | 52,135 |
Net income |  | 61,348 |  |  | 18,925 |  |  | 72,266 |  |  | 58,819 |  |  | 56,150 |  |  | 55,435 |  |  | 81,859 |  |  | 45,760 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 1.04 |  |  | 0.32 |  |  | 1.22 |  |  | 1.00 |  |  | 0.94 |  |  | 0.94 |  |  | 1.38 |  |  | 0.77 |
Diluted |  | 1.02 |  |  | 0.32 |  |  | 1.21 |  |  | 0.99 |  |  | 0.93 |  |  | 0.93 |  |  | 1.36 |  |  | 0.76 |
The addition of all quarters may not agree to annual amounts on the Financial Statements due to rounding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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