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Debt and Credit Facilities (Credit Facilities) (Details) - Sep. 30, 2015
£ in Thousands, $ in Thousands
USD ($)
GBP (£)
Debt Instrument [Line Items]    
Long-term line of credit $ 619,810 £ 70,000
Citibank Europe PLC | Syndicate 1458 | Letter of Credit    
Debt Instrument [Line Items]    
Letters of credit outstanding 300,000  
Long-term line of credit | £   £ 70,000
Citibank Europe PLC | RenaissanceRe Specialty Risks Ltd. | Letter of Credit    
Debt Instrument [Line Items]    
Letters of credit outstanding 8,789  
Standby Letter of Credit Facility | Wells Fargo    
Debt Instrument [Line Items]    
Letters of credit outstanding 160,341  
Standby Letter of Credit Facility | National Australia Bank Limited    
Debt Instrument [Line Items]    
Letters of credit outstanding 0  
Bilateral Facility | Citibank Europe PLC | Bilateral Facility Participants | Letter of Credit    
Debt Instrument [Line Items]    
Letters of credit outstanding 150,680  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 0