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Segment reporting - Customer Concentration (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue, Major Customer [Line Items]        
Gross premiums written $ 126,403 $ 45,425 $ 359,498 $ 239,660
Gross Premiums Written
       
Revenue, Major Customer [Line Items]        
Gross premiums written 126,403 45,425 359,498 239,660
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%
Gross Premiums Written | Customer Concentration Risk
       
Revenue, Major Customer [Line Items]        
Gross premiums written     359,498 239,660
Concentration risk, percentage     100.00% 100.00%
Gross Premiums Written | Customer Concentration Risk | Willis Re [Member]
       
Revenue, Major Customer [Line Items]        
Gross premiums written     55,589 13,421
Concentration risk, percentage     15.50% 5.60%
Gross Premiums Written | Customer Concentration Risk | Advocate Reinsurance Partners, LLC
       
Revenue, Major Customer [Line Items]        
Gross premiums written     51,002 26,000
Concentration risk, percentage     14.20% 10.80%
Gross Premiums Written | Customer Concentration Risk | Stonehill Reinsurance Partners, LLC [Member]
       
Revenue, Major Customer [Line Items]        
Gross premiums written     44,744 0
Concentration risk, percentage     12.40% 0.00%
Gross Premiums Written | Customer Concentration Risk | Aon Benfield - a division of Aon plc
       
Revenue, Major Customer [Line Items]        
Gross premiums written     54,072 91,349
Concentration risk, percentage     15.00% 38.20%
Gross Premiums Written | Customer Concentration Risk | TigerRisk Partners LLC [Member]
       
Revenue, Major Customer [Line Items]        
Gross premiums written     13,852 10,472
Concentration risk, percentage     3.90% 4.40%
Gross Premiums Written | Customer Concentration Risk | Guy Carpenter & Company, LLC
       
Revenue, Major Customer [Line Items]        
Gross premiums written     91,567 (11,927)
Concentration risk, percentage     25.50% (5.00%)
Gross Premiums Written | Customer Concentration Risk | BMS Intermediaries
       
Revenue, Major Customer [Line Items]        
Gross premiums written     0 46,095
Concentration risk, percentage     0.00% 19.20%
Gross Premiums Written | Customer Concentration Risk | Other brokers
       
Revenue, Major Customer [Line Items]        
Gross premiums written     3,203 7,545
Concentration risk, percentage     0.90% 3.10%
Gross Premiums Written | Customer Concentration Risk | Total broker placed
       
Revenue, Major Customer [Line Items]        
Gross premiums written     314,029 182,955
Concentration risk, percentage     87.40% 76.30%
Gross Premiums Written | Customer Concentration Risk | Direct placements
       
Revenue, Major Customer [Line Items]        
Gross premiums written     $ 45,469 $ 56,705
Concentration risk, percentage     12.60% 23.70%