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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine months ended |
| (common shares in thousands) | September 30, 2017 |  | September 30, 2016 |  | September 30, 2017 |  | September 30, 2016 |
| Numerator: |  |  |  |  |  |  |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders | $ | (504,812 | ) |  | $ | 146,825 |  |  | $ | (241,318 | ) |  | $ | 411,145 |  |
| Amount allocated to participating common shareholders (1) | (116 | ) |  | (1,770 | ) |  | (344 | ) |  | (4,939 | ) |
| Net (loss) income allocated to RenaissanceRe common shareholders | $ | (504,928 | ) |  | $ | 145,055 |  |  | $ | (241,662 | ) |  | $ | 406,206 |  |
| Denominator: |  |  |  |  |  |  |  |
| Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares | 39,591 |  |  | 40,513 |  |  | 39,979 |  |  | 41,594 |  |
| Per common share equivalents of employee stock options and restricted shares | — |  |  | 220 |  |  | — |  |  | 248 |  |
| Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 39,591 |  |  | 40,733 |  |  | 39,979 |  |  | 41,842 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic | $ | (12.75 | ) |  | $ | 3.58 |  |  | $ | (6.04 | ) |  | $ | 9.77 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted | $ | (12.75 | ) |  | $ | 3.56 |  |  | $ | (6.04 | ) |  | $ | 9.71 |  |
(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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