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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income available to RenaissanceRe common shareholders $ 73,233 $ 120,752 $ 241,076 $ 271,755
Amount allocated to participating common shareholders (819) (1,557) (2,781) (3,577)
Net income allocated to RenaissanceRe common shareholders $ 72,414 $ 119,195 $ 238,295 $ 268,178
Denominator:        
Denominator for basic income per RenaissanceRe common share - weighted average common shares 45,303 39,736 42,467 40,487
Per common share equivalents of employee stock options and restricted shares 354 659 372 662
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 45,657 40,395 42,839 41,149
Net income available to RenaissanceRe common shareholders per common share – basic (in usd per share) $ 1.60 $ 3.00 $ 5.61 $ 6.62
Net income available to RenaissanceRe common shareholders per common share – diluted (in usd per share) $ 1.59 $ 2.95 $ 5.56 $ 6.52