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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per common share:
| Year ended December 31, | 2017 |  | 2016 |  | 2015 |
| (thousands of shares) |  |  |  |  |  |
| Numerator: |  |  |  |  |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders | $ | (244,770 | ) |  | $ | 480,581 |  |  | $ | 408,811 |  |
| Amount allocated to participating common shareholders (1) | (457 | ) |  | (5,666 | ) |  | (4,721 | ) |
| Net (loss) income allocated to RenaissanceRe common shareholders | $ | (245,227 | ) |  | $ | 474,915 |  |  | $ | 404,090 |  |
| Denominator: |  |  |  |  |  |
| Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares | 39,854 |  |  | 41,314 |  |  | 43,157 |  |
| Per common share equivalents of employee stock options and performance shares | — |  |  | 245 |  |  | 369 |  |
| Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 39,854 |  |  | 41,559 |  |  | 43,526 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic | $ | (6.15 | ) |  | $ | 11.50 |  |  | $ | 9.36 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted | $ | (6.15 | ) |  | $ | 11.43 |  |  | $ | 9.28 |  |
(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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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