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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ 233 $ (156,229) $ (4,073) $ (187,564)
Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (2) (88) 17 (70)
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     12,640 (170,707)
Property | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     5,809 (5,682)
Property | Large and Small Catastrophe Events and Attritional Loss Movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     6,831 (165,025)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (2,690) (156,213)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (56,234) (156,213)
Property | New Zealand Earthquake (2011)        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (7,485)  
Property | Tohoku Earthquake and Tsunami (2011)        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (4,693)  
Property | New Zealand Earthquake (2010)        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     25,865  
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     52,132  
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (12,275)  
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     9,521 (8,812)
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     9,521 (8,812)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years 10,763 (143,145) 12,640 (170,707)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (16,730) (16,787)
Casualty and Specialty | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     12,120 (7,786)
Casualty and Specialty | Actuarial methods        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (28,850) (9,001)
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (10,528) $ (12,996) $ (16,730) $ (16,787)