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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 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years $ (45,104) $ (29,255) $ (16,098) $ (30,859)  
Ogden Rate          
Liability for Catastrophe Claims [Line Items]          
Discount rate     (0.75%)   2.50%
Other          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years $ (227) $ 85 $ (555) 3  
Property          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (24,800) (18,989)  
Property | Actuarial assumption changes          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (843) 0  
Property | Large and Small Catastrophe Events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (25,643) (18,989)  
Property | Large catastrophe events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     1,851 1,054  
Property | New Zealand Earthquake (2011)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     5,807 0  
Property | New Zealand Earthquake (2010)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     4,061 2,962  
Property | April and May U.S. Tornadoes (2011)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (4,153) (1,408)  
Property | Other          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (3,864) (500)  
Property | Small catastrophe events          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (27,494) (20,043)  
Property | Fort McMurray Wildfire (2016)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (5,848) 0  
Property | Tianjin Explosion (2015)          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (4,896) 0  
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     (3,906) (6,260)  
Property | Other          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (12,844) (13,783)  
Casualty and Specialty          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     9,257 (11,873)  
Casualty and Specialty | Actuarial assumption changes          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (2,462) (6,118)  
Casualty and Specialty | Actuarial methods - actual reported claims lower than expected claims          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     (21,762) (5,755)  
Casualty and Specialty | Ogden Rate change          
Liability for Catastrophe Claims [Line Items]          
Net claims and claim expenses incurred – prior accident years     $ 33,481 $ 0