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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 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (3,452) $ (504,812) $ 171,142 $ 92,352 $ 69,436 $ 146,825 $ 136,325 $ 127,995 $ (244,770) $ 480,581 $ 408,811
Amount allocated to participating common shareholders                 (457) (5,666) (4,721)
Net (loss) income allocated to RenaissanceRe common shareholders                 $ (245,227) $ 474,915 $ 404,090
Denominator:                      
Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares (in shares) 39,478 39,591 39,937 40,408 40,474 40,513 41,693 42,577 39,854 41,314 43,157
Per common share equivalents of employee stock options and performance shares (in shares)                 0 245 369
Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 39,478 39,591 40,024 40,623 40,707 40,733 41,885 42,912 39,854 41,559 43,526
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic (in usd per share) $ (0.09) $ (12.75) $ 4.25 $ 2.26 $ 1.70 $ 3.58 $ 3.23 $ 2.97 $ (6.15) $ 11.50 $ 9.36
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in usd per share) $ (0.09) $ (12.75) $ 4.24 $ 2.25 $ 1.69 $ 3.56 $ 3.22 $ 2.95 $ (6.15) $ 11.43 $ 9.28