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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Mar. 31, 2018
£ in Thousands, $ in Thousands
USD ($)
GBP (£)
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 468,388 £ 10,000
Wells Fargo | Uncommitted Standby Letter of Credit Facility | Letter of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 101,679  
Citibank Europe PLC | Bilateral Facility | Letter of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 186,709  
Bank Of Montreal, Citibank Europe and ING Bank | Renaissance Reinsurance FAL Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 180,000  
Bank Of Montreal, Citibank Europe and ING Bank | Specialty Risks FAL Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding | £   £ 10,000
Revolving Credit Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 0