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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years $ (9,416) $ 12,435 $ (196,980) $ (3,663)  
Ogden Rate | Discount rate          
Liability for Catastrophe Claims [Line Items]          
Cash surrender value, measurement input (0.0075)   (0.0075)   0.025
Other          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years $ (18) $ (155) $ (88) (710)  
Property          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (172,872) (16,968)  
Property | Actuarial assumption changes          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (5,682) 843  
Property | Large and Small Catastrophe Events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (167,190) (17,811)  
Property | Large catastrophe events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (158,468) 2,764  
Property | 2017 Catastrophe Events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (151,155)    
Property | Other          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (7,313) (3,881)  
Property | New Zealand Earthquake (2011)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years       5,807  
Property | New Zealand Earthquake (2010)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years       5,001  
Property | April and May U.S. Tornadoes (2011)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years       (4,163)  
Property | Small catastrophe events and attritional loss movements          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (8,722) (20,575)  
Property | Other small catastrophe events and attritional loss movements          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (8,722) (9,293)  
Property | Fort McMurray Wildfire (2016)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years       (6,386)  
Property | Tianjin Explosion (2015)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years       (4,896)  
Casualty and Specialty          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (24,020) 14,015  
Casualty and Specialty | Actuarial methods          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (16,234) (17,004)  
Casualty and Specialty | Actuarial assumption changes          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (7,786) (2,462)  
Casualty and Specialty | Ogden Rate change          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     $ 0 $ 33,481