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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Dec. 31, 2015
£ in Thousands, $ in Thousands
USD ($)
GBP (£)
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 712,126 £ 85,000
Wells Fargo | Standby Letter of Credit Facility    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 163,264  
National Australia Bank Limited | Standby Letter of Credit Facility    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 0  
Citibank Europe PLC | Letter of Credit | Syndicate 1458    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 360,000 £ 85,000
Citibank Europe PLC | Letter of Credit | RenaissanceRe Specialty Risks Ltd.    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 8,861  
Citibank Europe PLC | Bilateral Facility | Letter of Credit | Bilateral Facility Participants    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 180,001  
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Line of credit facility, outstanding amount $ 0