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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (15,406) $ 233 $ (1,506) $ (4,073)
Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years       5,809
Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (44) (2) (151) 17
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     7,444 12,640
Property | Actuarial methods        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     43,500  
Property | Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years       5,800
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
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (29,067) (2,690)
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (19,940)  
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (12,306) 52,132
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (3,825) (56,234)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     7,004 1,412
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     36,511 9,521
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     36,511 9,521
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (6,564) 10,763 7,444 12,640
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (8,799) (16,730)
Casualty and Specialty | Actuarial methods        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (8,799) (28,850)
Casualty and Specialty | Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     0 12,120
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (8,798) $ (10,528) $ (8,799) $ (16,730)