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Reserve for Claims and Claim Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 02, 2015
Dec. 31, 2014
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses $ 3,493,778 $ 2,568,730 $ 2,632,519   $ 1,345,816
Net claims and claim expenses incurred – prior accident years (40,996) (164,126) (162,447)    
Claims and claim expenses recovered (1,558,960) (179,820) (96,734)    
Reinsurance balances payable          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Aggregate deposit liabilities 21,700 25,700      
Aggregate deposit assets          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Aggregate deposit assets 0 0      
Other          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses 673        
Net claims and claim expenses incurred – prior accident years (1,583) (1,110) (870)    
Deposit Contracts, Underwriting Risk Only          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Claims and claim expenses recovered 200 200 300    
Deposit Contracts, Timing Risk Only          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Increase (decrease) in other income related to assumed reinsurance contracts 3,700 6,200 6,200    
Property          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses 1,343,290        
Net claims and claim expenses incurred – prior accident years (45,596) (104,876) (93,786)    
Property | Actuarial assumption changes          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years 842   (1,501)    
Property | Large Catastrophe Event          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (7,640) (33,926) (34,280)    
Property | Thailand Floods (2011)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (2,513) (15,131) (18,823)    
Property | Storm Sandy (2012)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (4,395) (10,849) (12,503)    
Property | Tohoku Earthquake and Tsunami (2011)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years   (7,314) (5,313)    
Property | New Zealand Earthquake (2010)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years 4,061 6,904 1,095    
Property | New Zealand Earthquake (2011)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years 5,807 1,987 22,754    
Property | April and May U.S. Tornadoes (2011)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (4,177)   (10,190)    
Property | Small catastrophe events          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (38,798) (70,950) (58,005)    
Property | U.S. PCS Wind And Thunderstorms (2015 and 2013)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years   (17,000)      
Property | Tianjin Explosion (2015)          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (8,002) (5,686)      
Property | Other Large and Small Catastrophe Events          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years     (69,300)    
Property | 2011 International Events          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years     (1,382)    
Casualty and Specialty          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses 2,149,815        
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          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years (24,836) (52,601) (72,551)    
Casualty and Specialty | Actuarial assumption changes          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net claims and claim expenses incurred – prior accident years $ (2,462) $ (5,539) $ 4,760    
Platinum Underwriters Holdings, Ltd.          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses       $ 1,400,000  
Platinum Underwriters Holdings, Ltd. | Property          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses       179,700  
Platinum Underwriters Holdings, Ltd. | Casualty and Specialty          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Net reserve for claims and claim expenses       $ 1,200,000