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Reserve for Claims and Claim Expenses (Liability for Catastrophe Claims) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (40,996) $ (164,126) $ (162,447)
Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (1,583) (1,110) (870)
Property      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (45,596) (104,876) (93,786)
Property | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 842   (1,501)
Property | Large and Small Catastrophe Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (46,438) (104,876) (92,285)
Property | Large Catastrophe Event      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (7,640) (33,926) (34,280)
Property | Storm Sandy (2012)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (4,395) (10,849) (12,503)
Property | April and May U.S. Tornadoes (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (4,177)   (10,190)
Property | Thailand Floods (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (2,513) (15,131) (18,823)
Property | Hurricane Matthew (2016)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (1,239)    
Property | New Zealand Earthquake (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 5,807 1,987 22,754
Property | New Zealand Earthquake (2010)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 4,061 6,904 1,095
Property | Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (5,184) (9,523) (11,300)
Property | Tohoku Earthquake and Tsunami (2011)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   (7,314) (5,313)
Property | 2011 International Events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years     (1,382)
Property | Small catastrophe events      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (38,798) (70,950) (58,005)
Property | 2016 PCS Events (2016)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (18,550)    
Property | Tianjin Explosion (2015)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (8,002) (5,686)  
Property | Fort McMurray Wildfire (2016)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (6,364)    
Property | Other      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years (5,882) (48,232) (58,005)
Property | U.S. PCS 13/14 Wind and Thunderstorm (2013)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   (6,286)  
Property | U.S. PCS 15 Wind and Thunderstorm (2013)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   (5,648)  
Property | U.S. PCS 81 Wind and Thunderstorm (2015)      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years   (5,098)  
Casualty and Specialty      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 6,183 (58,140) (67,791)
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 (24,836) (52,601) (72,551)
Casualty and Specialty | Ogden Rate change      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years 33,481 0 0
Casualty and Specialty | Actuarial assumption changes      
Liability for Catastrophe Claims [Line Items]      
Net claims and claim expenses incurred – prior accident years $ (2,462) $ (5,539) $ 4,760
Ogden Rate [Member]      
Liability for Catastrophe Claims [Line Items]      
Discount rate (0.75%) 2.50%