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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (31,335) $ 29,006
Ogden Rate | Maximum    
Liability for Catastrophe Claims [Line Items]    
Discount rate   2.50%
Ogden Rate | Minimum    
Liability for Catastrophe Claims [Line Items]    
Discount rate   (0.75%)
Other    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 18 $ (328)
Property    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (27,562) (928)
Property | Large and Small Catastrophe Events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (27,562) (928)
Property | Large catastrophe events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (31,367) 2,586
Property | 2017 Catastrophe Events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (27,109)  
Property | Other    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (4,258) 2,586
Property | Small catastrophe events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 3,805 (3,514)
Property | Fort McMurray Wildfire (2016)    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years   (5,850)
Property | Other    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 3,805 2,336
Property | Other Large and Small Catastrophic Events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (500)  
Casualty and Specialty    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (3,791) 30,262
Casualty and Specialty | Actuarial methods    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (3,791) (5,999)
Casualty and Specialty | Ogden Rate change    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 0 33,481
Casualty and Specialty | Actuarial assumption changes    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years $ 0 $ 2,780