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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income available to RenaissanceRe common shareholders $ 36,698 $ 32,681 $ 678,269 $ 281,182
Amount allocated to participating common shareholders (446) (294) (8,074) (2,977)
Net income allocated to RenaissanceRe common shareholders $ 36,252 $ 32,387 $ 670,195 $ 278,205
Denominator:        
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares) 43,462 39,624 43,003 39,606
Per common share equivalents of employee stock options and restricted shares (in shares) 75 13 46 21
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 43,537 39,637 43,049 39,627
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 0.83 $ 0.82 $ 15.58 $ 7.02
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 0.83 $ 0.82 $ 15.57 $ 7.02