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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income available to RenaissanceRe common shareholders $ 171,142 $ 136,325 $ 263,494 $ 264,320
Amount allocated to participating common shareholders (1,585) (1,561) (2,526) (3,166)
Net income allocated to RenaissanceRe common shareholders $ 169,557 $ 134,764 $ 260,968 $ 261,154
Denominator:        
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares) 39,937 41,693 40,172 42,135
Per common share equivalents of employee stock options and restricted shares (in shares) 87 192 152 263
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 40,024 41,885 40,324 42,398
Net income available to RenaissanceRe common shareholders per common share – basic $ 4.25 $ 3.23 $ 6.50 $ 6.20
Net income available to RenaissanceRe common shareholders per common share – diluted $ 4.24 $ 3.22 $ 6.47 $ 6.16