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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Numerator: |  |  |  |
Net income available to RenaissanceRe common shareholders | $ 151,003 |  | $ 190,474 |
Amount allocated to participating common shareholders | (2,031) | [1] | (2,918) | [1]
Net income allocated to RenaissanceRe common shareholders | $ 148,972 |  | $ 187,556 |
Denominator: |  |  |  |
Denominator for basic income per RenaissanceRe common share - weighted average common shares | 41,238 |  | 43,461 |
Per common share equivalents of employee stock options and restricted shares | 665 |  | 829 |
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 41,903 |  | 44,290 |
Basic income per RenaissanceRe common share, in dollars per share | $ 3.61 |  | $ 4.32 |
Diluted income per RenaissanceRe common share, in dollars per share | $ 3.56 |  | $ 4.23 |
[1] | Represents earnings attributable to holders of unvested restricted shares issued under the Company’s 2001 Stock Incentive Plan and Non-Employee Director Stock Incentive Plan.

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