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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income available to RenaissanceRe common shareholders $ 47,799 $ 36,698 $ 541,670 $ 678,269
Amount allocated to participating common shareholders (582) (446) (6,677) (8,074)
Net income allocated to RenaissanceRe common shareholders $ 47,217 $ 36,252 $ 534,993 $ 670,195
Denominator:        
Denominator for basic income per RenaissanceRe common share - weighted average common shares 50,009 43,462 46,130 43,003
Per common share equivalents of employee stock options and non-vested shares 85 75 70 46
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 50,094 43,537 46,200 43,049
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 0.94 $ 0.83 $ 11.60 $ 15.58
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 0.94 $ 0.83 $ 11.58 $ 15.57