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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jan. 01, 2016
Jan. 01, 2015
DaVinciRe Holdings Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Parent company ownership in redeemable noncontrolling interest     24.00%   24.00%   26.30%    
Sale of shares to redeemable noncontrolling interest     $ 0 $ 0 $ 43,040 $ 0      
Redemption of shares from redeemable noncontrolling interest     $ 400 1,007 $ 92,204 209,718      
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest                  
Redeemable Noncontrolling Interest [Line Items]                  
Parent company ownership in redeemable noncontrolling interest               24.00% 26.30%
Redeemable noncontrolling interest, net redemptions $ 100,000 $ 225,000              
Redeemable noncontrolling interest, reserve holdback $ 10,000 $ 22,500              
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest | Maximum                  
Redeemable Noncontrolling Interest [Line Items]                  
Share repurchase requests, limit     25.00%   25.00%        
RenaissanceRe Medici Fund Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Parent company ownership in redeemable noncontrolling interest     36.40%   36.40%   46.10%    
Redemption provision, notice period         30 days        
Sale of shares to redeemable noncontrolling interest     $ 21,298 4,980 $ 78,615 36,073 $ 36,100    
Redemption of shares from redeemable noncontrolling interest     $ 14,389 $ 1,910 $ 21,729 $ 19,017 $ 20,100