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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2020
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) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net premiums earned |  | $ | 651,703 |  |  | 632,573 |  |  | 630,671 |  |  | 642,619 |  |  | 694,541 |  |  | 653,620 |  |  | 704,899 |  |  | 668,359 |
Net investment income earned |  | 55,967 |  |  | 50,618 |  |  | 34,444 |  |  | 58,505 |  |  | 68,185 |  |  | 55,826 |  |  | 68,511 |  |  | 57,594 |
Net realized and unrealized (losses) gains |  | (44,666) |  |  | 13,451 |  |  | 12,649 |  |  | 4,027 |  |  | 7,721 |  |  | (2,183) |  |  | 20,079 |  |  | (873) |
Other income |  | 1,825 |  |  | 2,320 |  |  | 4,683 |  |  | 3,053 |  |  | 6,119 |  |  | 3,162 |  |  | 4,943 |  |  | 3,820 |
Total revenues |  | 664,829 |  |  | 698,962 |  |  | 682,447 |  |  | 708,204 |  |  | 776,566 |  |  | 710,425 |  |  | 798,432 |  |  | 728,900 |
Income before federal income taxes |  | 15,997 |  |  | 73,694 |  |  | 42,693 |  |  | 90,225 |  |  | 85,257 |  |  | 71,178 |  |  | 159,041 |  |  | 101,293 |
Net income |  | 15,236 |  |  | 61,348 |  |  | 34,183 |  |  | 72,266 |  |  | 69,875 |  |  | 56,150 |  |  | 127,061 |  |  | 81,859 |
Net income available to common stockholders |  | 15,236 |  |  | 61,348 |  |  | 34,183 |  |  | 72,266 |  |  | 69,875 |  |  | 56,150 |  |  | 127,061 |  |  | 81,859 |
Net income available to common stockholders per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | 0.26 |  |  | 1.04 |  |  | 0.57 |  |  | 1.22 |  |  | 1.17 |  |  | 0.94 |  |  | 2.12 |  |  | 1.38 |
Diluted |  | 0.25 |  |  | 1.02 |  |  | 0.57 |  |  | 1.21 |  |  | 1.16 |  |  | 0.93 |  |  | 2.10 |  |  | 1.36 |
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=121640914&loc=d3e1280-108306 + Details
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