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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Jun. 30, 2018
£ in Thousands, $ in Thousands
USD ($)
GBP (£)
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 454,254 £ 0
Renaissance Reinsurance FAL Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 180,000  
Specialty Risks FAL Facility (1) | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding | £   £ 0
Wells Fargo | Uncommitted Standby Letter of Credit Facility | Letter of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 93,475  
Citibank Europe PLC | Bilateral Facility | Letter of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding 180,779  
Revolving Credit Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 0