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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, 2019
Mar. 31, 2018
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (4,306) $ (31,335)
Other    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 19 18
Property    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 1,877 (27,562)
Property | Large catastrophe events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (12,292) (31,367)
Property | 2017 Large Loss Events    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (10,918) (27,109)
Property | Other    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years (1,374) (4,258)
Property | Small catastrophe events and attritional loss movements    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 14,169 3,805
Property | Other small catastrophe events and attritional loss movements    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years 14,169 3,805
Property | Other Large and Small Catastrophe 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 (6,202) (3,791)
Casualty and Specialty | Actuarial methods    
Liability for Catastrophe Claims [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (6,202) $ (3,791)