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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, 2019
Mar. 31, 2018
Numerator:    
Net income available to RenaissanceRe common shareholders $ 273,717 $ 56,713
Amount allocated to participating common shareholders (3,121) (546)
Net income allocated to RenaissanceRe common shareholders $ 270,596 $ 56,167
Denominator:    
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares) 42,065 39,552
Per common share equivalents of employee stock options and restricted shares (in shares) 26 47
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 42,091 39,599
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 6.43 $ 1.42
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 6.43 $ 1.42