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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.