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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
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Numerator: |  |  |  |
Net income available to RenaissanceRe common shareholders | $ 190,474 |  | $ 201,429 |
Amount allocated to participating common shareholders | (2,918) | [1] | (3,404) | [1]
Net income allocated to RenaissanceRe common shareholders | $ 187,556 |  | $ 198,025 |
Denominator: |  |  |  |
Denominator for basic income per RenaissanceRe common share - weighted average common shares | 43,461 |  | 50,377 |
Per common share equivalents of employee stock options and restricted shares | 829 |  | 604 |
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 44,290 |  | 50,981 |
Basic income per RenaissanceRe common share (usd per share) | $ 4.32 |  | $ 3.93 |
Diluted income per RenaissanceRe common share (usd per share) | $ 4.23 |  | $ 3.88 |
[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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