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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
| Year ended December 31, | 2019 |  | 2018 |  | 2017 |
| (common shares in thousands) |  |  |  |  |  |
| Numerator: |  |  |  |  |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders | $ | 712,042 |  |  | $ | 197,276 |  |  | $ | (244,770 | ) |
| Amount allocated to participating common shareholders (1) | (8,545 | ) |  | (2,121 | ) |  | (457 | ) |
| Net income (loss) allocated to RenaissanceRe common shareholders | $ | 703,497 |  |  | $ | 195,155 |  |  | $ | (245,227 | ) |
| Denominator: |  |  |  |  |  |
| Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares | 43,119 |  |  | 39,732 |  |  | 39,854 |  |
| Per common share equivalents of employee stock options and performance shares | 56 |  |  | 23 |  |  | — |  |
| Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 43,175 |  |  | 39,755 |  |  | 39,854 |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic | $ | 16.32 |  |  | $ | 4.91 |  |  | $ | (6.15 | ) |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted | $ | 16.29 |  |  | $ | 4.91 |  |  | $ | (6.15 | ) |
(1) Represents earnings attributable to holders of unvested shares issued pursuant to the Company’s stock compensation plans 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://fasb.org/us-gaap/role/ref/legacyRef -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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