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Schedule II. Condensed Financial Information Of Registrant (Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 125,869 $ 112,277 $ 90,996 $ 213,100 $ 220,577 $ 103,887 $ 162,426 $ 199,366 $ 542,242 $ 686,256 $ 841,768
Comprehensive income (loss) attributable to RenaissanceRe                 429,884 532,003 681,133
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 431,192 532,718 690,624
Comprehensive income (loss) attributable to RenaissanceRe                 $ 431,192 $ 532,718 $ 690,624