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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Summary Of Quarterly Financial Data | The following table presents summarized quarterly financial data for 2017 and 2016:
|  | Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31
|  | (Amounts in thousands, except per share data)
2017 |  |  |  |  |  |  |  |
Net premiums earned |  | $ | 789,770 |  |  | $ | 797,666 |  |  | $ | 801,205 |  |  | $ | 806,796 |
Change in fair value of financial instruments pursuant to the fair value option |  | 21,857 |  |  | 20,275 |  |  | 17,608 |  |  | 28,065 |
Income before income taxes |  | 30,599 |  |  | 68,752 |  |  | 58,247 |  |  | 9,487 |
Net income (loss) |  | 26,980 |  |  | 51,633 |  |  | 46,485 |  |  | 19,779 |
Basic earnings per share (1) |  | 0.49 |  |  | 0.93 |  |  | 0.84 |  |  | 0.36 |
Diluted earnings per share (1) |  | 0.49 |  |  | 0.93 |  |  | 0.84 |  |  | 0.36 |
Dividends paid per share |  | 0.6225 |  |  | 0.6225 |  |  | 0.6225 |  |  | 0.6250 |
2016 |  |  |  |  |  |  |  |
Net premiums earned |  | $ | 767,085 |  |  | $ | 779,321 |  |  | $ | 790,850 |  |  | $ | 794,517 |
Change in fair value of financial instruments pursuant to the fair value option |  | 18,531 |  |  | 37,127 |  |  | (21,132 | ) |  | (67,332 | )
Income before income taxes |  | 26,034 |  |  | 64,335 |  |  | 31,625 |  |  | (51,270 | )
Net income (loss) |  | 23,323 |  |  | 48,873 |  |  | 26,930 |  |  | (26,082 | )
Basic earnings per share (1) |  | 0.42 |  |  | 0.88 |  |  | 0.49 |  |  | (0.47 | )
Diluted earnings per share (1) |  | 0.42 |  |  | 0.88 |  |  | 0.49 |  |  | (0.47 | )
Dividends paid per share |  | 0.6200 |  |  | 0.6200 |  |  | 0.6200 |  |  | 0.6225 |
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(1) | The basic and diluted earnings per share do not sum 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/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=68076893&loc=d3e1280-108306 + Details
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