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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income available to RenaissanceRe common shareholders $ 127,995 $ 167,843
Amount allocated to participating common shareholders (1,601) (2,025)
Net income allocated to RenaissanceRe common shareholders $ 126,394 $ 165,818
Denominator:    
Denominator for basic income per RenaissanceRe common share - weighted average common shares 42,577 39,631
Per common share equivalents of employee stock options and restricted shares 335 390
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 42,912 40,021
Net income available to RenaissanceRe common shareholders per common share – basic (in usd per share) $ 2.97 $ 4.18
Net income available to RenaissanceRe common shareholders per common share – diluted (in usd per share) $ 2.95 $ 4.14