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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, 2012
Mar. 31, 2011
Numerator:    
Net (loss) income (attributable) available to RenaissanceRe common shareholders $ 201,429 $ (248,033)
Amount allocated to participating common shareholders (3,404) [1] 6,327 [1]
Net (loss) income allocated to RenaissanceRe common shareholders $ 198,025 $ (241,706)
Denominator:    
Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares (In shares) 50,377 51,504
Per common share equivalents of employee stock options and restricted shares (In shares) 604 0
Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (In shares) 50,981 51,504
Basic (loss) income per RenaissanceRe common share (In dollars per share) $ 3.93 $ (4.69)
Diluted (loss) income per RenaissanceRe common share (In dollars per share) $ 3.88 $ (4.69)
[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.