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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net income available to RenaissanceRe common shareholders $ 367,854 $ 191,788 $ 641,571 $ 248,501
Amount allocated to participating common shareholders (4,393) (2,174) (7,483) (2,583)
Net income allocated to RenaissanceRe common shareholders $ 363,461 $ 189,614 $ 634,088 $ 245,918
Denominator:        
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares) 43,483 39,641 42,774 39,597
Per common share equivalents of employee stock options and restricted shares (in shares) 38 13 32 25
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 43,521 39,654 42,806 39,622
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 8.36 $ 4.78 $ 14.82 $ 6.21
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 8.35 $ 4.78 $ 14.81 $ 6.21