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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2016
Jan. 01, 2015
DaVinciRe Holdings Ltd.            
Noncontrolling Interest [Line Items]            
Redeemable noncontrolling interest, ownership percentage     24.00% 26.30%    
Noncontrolling interest, value subscribed     $ 43,040 $ 0    
Redemption of shares from redeemable noncontrolling interests     $ 98,285 $ 212,750    
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest            
Noncontrolling Interest [Line Items]            
Redeemable noncontrolling interest, ownership percentage         24.00% 26.30%
Share repurchase requests, percent of aggregate shares, limit     50.00%      
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            
Noncontrolling Interest [Line Items]            
Share repurchase requests, limit     25.00%      
RenaissanceRe Medici Fund Ltd.            
Noncontrolling Interest [Line Items]            
Redeemable noncontrolling interest, ownership percentage     36.50% 46.10%    
Noncontrolling interest, value subscribed     $ 79,518 $ 36,073    
Redemption of shares from redeemable noncontrolling interests     $ 21,729 $ 20,117