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Segment reporting - Geographic information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue from External Customer [Line Items]    
Gross premiums written $ 87,587 $ 96,020
Gross Premiums Written
   
Revenue from External Customer [Line Items]    
Gross premiums written 87,587 96,020
Concentration risk, percentage 100.00% 100.00%
Gross Premiums Written | United States
   
Revenue from External Customer [Line Items]    
Gross premiums written 58,077 49,657
Concentration risk, percentage 66.30% 51.70%
Gross Premiums Written | United Kingdom
   
Revenue from External Customer [Line Items]    
Gross premiums written 24,837 0
Concentration risk, percentage 28.40% 0.00%
Gross Premiums Written | Bermuda
   
Revenue from External Customer [Line Items]    
Gross premiums written 4,673 44,963
Concentration risk, percentage 5.30% 46.80%
Gross Premiums Written | Other
   
Revenue from External Customer [Line Items]    
Gross premiums written $ 0 $ 1,400
Concentration risk, percentage 0.00% 1.50%