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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (53,877) $ (10,447) $ (55,383) $ (14,520)
Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years       9,245
Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years 20 161 (131) 178
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (31,425) 5,020
Property | Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     5,445 9,200
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     (36,870) (4,225)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (23,577) (5,391)
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (13,435)  
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (12,306) 61,592
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (9,101) (90,817)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     11,265 23,834
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (13,293) 1,166
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (13,293) 1,166
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (38,869) (7,620) (31,425) 5,020
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (23,827) (19,718)
Casualty and Specialty | Actuarial methods        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (27,944) (54,527)
Casualty and Specialty | Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     4,117 34,809
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (15,028) $ (2,988) $ (23,827) $ (19,718)