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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (183,812) $ (26,855) $ (270,749)
Actuarial assumption changes      
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 212 (40) (197)
Property      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (157,261) (2,933) (221,290)
Property | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 5,445 9,200 (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 (162,706) (12,178) (215,608)
Property | Large catastrophe events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (120,905) (17,557) (182,029)
Property | 2019 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (44,389)    
Property | 2018 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (43,991) 81,555  
Property | 2017 Large Loss Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (32,649) (101,572) (172,512)
Property | Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 124 (31,916) (9,517)
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 (41,801) 5,379 (33,579)
Property | Other small catastrophe events and attritional loss movements      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (41,801) 5,379 (33,579)
Property | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (157,261) (2,933) (221,290)
Casualty and Specialty      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (26,763) (23,882) (49,262)
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 (29,280) (52,796) (41,476)
Casualty and Specialty | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 2,517 28,914 (7,786)
Casualty and Specialty | Operating Segments      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (26,763) $ (23,882) $ (49,262)