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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 142,270 $ 24,764 $ 343,699 $ (223,269)
Amount allocated to participating common shareholders (2,236) [1] (461) [1] (5,601) [1] (514) [1]
Net income (loss) allocated to RenaissanceRe common shareholders $ 140,034 $ 24,303 $ 338,098 $ (223,783)
Denominator:        
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (In shares) 50,278 50,493 50,328 50,994
Per common share equivalents of employee stock options and restricted shares (In shares) 734 557 669 0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (In shares) 51,012 51,050 50,997 50,994
Basic income (loss) per RenaissanceRe common share (In dollars per share) $ 2.78 $ 0.48 $ 6.72 $ (4.39)
Diluted income (loss) per RenaissanceRe common share (In dollars per share) $ 2.75 $ 0.48 $ 6.63 $ (4.39)
[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.