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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share | The following table sets forth the computation of basic and diluted earnings per common share:
|  | Three months ended |
| (common shares in thousands) | March 31, 2018 |  | March 31, 2017 |
| Numerator: |  |  |  |
| Net income available to RenaissanceRe common shareholders | $ | 56,713 |  |  | $ | 92,352 |  |
| Amount allocated to participating common shareholders (1) | (546 | ) |  | (907 | ) |
| Net income allocated to RenaissanceRe common shareholders | $ | 56,167 |  |  | $ | 91,445 |  |
| Denominator: |  |  |  |
| Denominator for basic income per RenaissanceRe common share - weighted average common shares | 39,552 |  |  | 40,408 |  |
| Per common share equivalents of employee stock options and restricted shares | 47 |  |  | 215 |  |
| Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 39,599 |  |  | 40,623 |  |
| Net income available to RenaissanceRe common shareholders per common share – basic | $ | 1.42 |  |  | $ | 2.26 |  |
| Net income available to RenaissanceRe common shareholders per common share – diluted | $ | 1.42 |  |  | $ | 2.25 |  |
(1) | Represents earnings attributable to holders of unvested restricted shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2010 Performance-Based Equity Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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