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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (10,447) $ (9,416) $ (14,520) $ (196,980)
Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years 161 (18) 178 (88)
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     5,020 (172,872)
Property | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     9,245 (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     (4,225) (167,190)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (5,391) (158,468)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (90,817) (151,155)
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     (4,693)  
Property | New Zealand Earthquake (2010)        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     46,741  
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     61,592  
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (10,717) (7,313)
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     1,166 (8,722)
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     1,166 (8,722)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (7,620) (2,165) 5,020 (172,872)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (19,718) (24,020)
Casualty and Specialty | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     34,809 (7,786)
Casualty and Specialty | Actuarial methods        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (54,527) (16,234)
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (2,988) $ (7,233) $ (19,718) $ (24,020)