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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (52,029) $ (15,406) $ (61,061) $ (1,506)
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (56,145) 7,293
Property | Actuarial methods - actual reported claims less than expected claims        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years       43,400
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     (56,145)  
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (31,103) (29,067)
Property | 2020 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     16,932  
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (1,424) (19,940)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (37,910) (12,306)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (5,708) (3,825)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (2,993) 7,004
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (25,042) 36,360
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (25,042) 36,360
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (50,983) (6,608) (56,145) 7,293
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (4,916) (8,799)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (4,916) (8,799)
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (1,046) $ (8,798) $ (4,916) $ (8,799)