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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Activity in redeemable noncontrolling interest          
Beginning balance     $ 1,296,506    
Net income attributable to redeemable noncontrolling interest $ 54,483 $ 37,612 84,382 $ 71,939  
Ending balance 1,493,428   1,493,428   $ 1,296,506
DaVinciRe Holdings Ltd.          
Activity in redeemable noncontrolling interest          
Beginning balance 1,032,543 986,646 1,011,659 994,458 994,458
Redemption of shares from redeemable noncontrolling interest, net of adjustments (370) (3,160) (439) (66,802)  
Sale of shares to redeemable noncontrolling interests 0 0 0 23,921  
Net income attributable to redeemable noncontrolling interest 50,252 36,432 71,205 68,341  
Ending balance 1,082,425 1,019,918 1,082,425 1,019,918 1,011,659
RenaissanceRe Medici Fund Ltd.          
Activity in redeemable noncontrolling interest          
Beginning balance 392,821 201,345 284,847 181,136 181,136
Redemption of shares from redeemable noncontrolling interest, net of adjustments (42,792) (15,285) (43,503) (25,910) (48,000)
Sale of shares to redeemable noncontrolling interests 56,743 34,925 156,482 63,341 149,200
Net income attributable to redeemable noncontrolling interest 4,231 1,180 13,177 3,598  
Ending balance $ 411,003 $ 222,165 $ 411,003 $ 222,165 $ 284,847