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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (249,470) $ (183,812) $ (26,855)
Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   5,445  
Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 0 0 0
Property      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (233,373) (157,049) (2,973)
Property | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 5,450 5,400 9,245
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 (238,823) (162,494) (12,218)
Property | Large catastrophe events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (204,072) (120,905) (17,557)
Property | 2020 Weather-Related Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 17,140    
Property | 2019 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (61,634) (44,389)  
Property | 2018 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (101,096) (43,991) 81,555
Property | 2017 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (49,090) (32,649) (101,572)
Property | Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (9,392) 124 (31,916)
Property | New Zealand Earthquake (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years     (7,497)
Property | Tohoku Earthquake and Tsunami (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years     (5,198)
Property | New Zealand Earthquake (2010)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years     47,071
Property | Small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (34,751) (41,589) 5,339
Property | Other small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (34,751) (41,589) 5,339
Property | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (233,373) (157,049) (2,973)
Casualty and Specialty      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (16,097) (26,763) (23,882)
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 (19,078) (29,280) (52,796)
Casualty and Specialty | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 2,981 2,517 28,914
Casualty and Specialty | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (16,097) $ (26,763) $ (23,882)