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Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Activity in redeemable noncontrolling interest          
Beginning balance     $ 1,175,594    
Net income attributable to redeemable noncontrolling interest $ 37,612 $ 30,635 71,939 $ 75,226  
Ending balance 1,242,083   1,242,083   $ 1,175,594
DaVinciRe Holdings Ltd.          
Activity in redeemable noncontrolling interest          
Beginning balance 986,646 926,141 994,458 930,955 930,955
Redemption of shares from redeemable noncontrolling interest (3,160) (986) (66,802) (91,804)  
Sale of shares to redeemable noncontrolling interests 0 0 23,921 43,040  
Net income attributable to redeemable noncontrolling interest 36,432 28,288 68,341 71,252  
Ending balance 1,019,918 953,443 1,019,918 953,443 994,458
RenaissanceRe Medici Fund Ltd.          
Activity in redeemable noncontrolling interest          
Beginning balance 201,345 155,196 181,136 115,009 115,009
Redemption of shares from redeemable noncontrolling interest (15,285) (6,400) (25,910) (7,340) (21,700)
Sale of shares to redeemable noncontrolling interests 34,925 17,817 63,341 57,317 79,500
Net income attributable to redeemable noncontrolling interest 1,180 2,347 3,598 3,974  
Ending balance $ 222,165 $ 168,960 $ 222,165 $ 168,960 $ 181,136