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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Six months ended |
| (common shares in thousands) | June 30, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016 |
| Numerator: |  |  |  |  |  |  |  |
| Net income available to RenaissanceRe common shareholders | $ | 171,142 |  |  | $ | 136,325 |  |  | $ | 263,494 |  |  | $ | 264,320 |  |
| Amount allocated to participating common shareholders (1) | (1,585 | ) |  | (1,561 | ) |  | (2,526 | ) |  | (3,166 | ) |
| Net income allocated to RenaissanceRe common shareholders | $ | 169,557 |  |  | $ | 134,764 |  |  | $ | 260,968 |  |  | $ | 261,154 |  |
| Denominator: |  |  |  |  |  |  |  |
| Denominator for basic income per RenaissanceRe common share - weighted average common shares | 39,937 |  |  | 41,693 |  |  | 40,172 |  |  | 42,135 |  |
| Per common share equivalents of employee stock options and restricted shares | 87 |  |  | 192 |  |  | 152 |  |  | 263 |  |
| Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 40,024 |  |  | 41,885 |  |  | 40,324 |  |  | 42,398 |  |
| Net income available to RenaissanceRe common shareholders per common share – basic | $ | 4.25 |  |  | $ | 3.23 |  |  | $ | 6.50 |  |  | $ | 6.20 |  |
| Net income available to RenaissanceRe common shareholders per common share – diluted | $ | 4.24 |  |  | $ | 3.22 |  |  | $ | 6.47 |  |  | $ | 6.16 |  |
(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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