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Segment reporting - Customer Concentration (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue, Major Customer [Line Items]        
Gross premiums written $ 145,508 $ 98,215 $ 233,095 $ 194,235
Gross Premiums Written
        
Revenue, Major Customer [Line Items]        
Gross premiums written 145,508 98,215 233,095 194,235
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     233,095 194,235
Concentration risk, percentage     100.00% 100.00%
Gross Premiums Written | Customer Concentration Risk | Willis Re [Member]
        
Revenue, Major Customer [Line Items]        
Gross premiums written     57,047 13,421
Concentration risk, percentage     24.50% 6.90%
Gross Premiums Written | Customer Concentration Risk | Advocate Reinsurance Partners, LLC
        
Revenue, Major Customer [Line Items]        
Gross premiums written     53,004 27,647
Concentration risk, percentage     22.70% 14.20%
Gross Premiums Written | Customer Concentration Risk | Stonehill Reinsurance Partners, LLC [Member]
        
Revenue, Major Customer [Line Items]        
Gross premiums written     46,659 0
Concentration risk, percentage     20.00% 0.00%
Gross Premiums Written | Customer Concentration Risk | Aon Benfield - a division of Aon plc
        
Revenue, Major Customer [Line Items]        
Gross premiums written     16,793 81,357
Concentration risk, percentage     7.20% 41.90%
Gross Premiums Written | Customer Concentration Risk | TigerRisk Partners LLC [Member]
        
Revenue, Major Customer [Line Items]        
Gross premiums written     14,496 9,531
Concentration risk, percentage     6.20% 4.90%
Gross Premiums Written | Customer Concentration Risk | Guy Carpenter & Company, LLC
        
Revenue, Major Customer [Line Items]        
Gross premiums written     15,074 (11,057)
Concentration risk, percentage     6.50% (5.70%)
Gross Premiums Written | Customer Concentration Risk | BMS Intermediaries
        
Revenue, Major Customer [Line Items]        
Gross premiums written     0 10,019
Concentration risk, percentage     0.00% 5.20%
Gross Premiums Written | Customer Concentration Risk | Other brokers
        
Revenue, Major Customer [Line Items]        
Gross premiums written     2,984 7,097
Concentration risk, percentage     1.30% 3.70%
Gross Premiums Written | Customer Concentration Risk | Total broker placed
        
Revenue, Major Customer [Line Items]        
Gross premiums written     206,057 138,015
Concentration risk, percentage     88.40% 71.10%
Gross Premiums Written | Customer Concentration Risk | Direct placements
        
Revenue, Major Customer [Line Items]        
Gross premiums written     $ 27,038 $ 56,220
Concentration risk, percentage     11.60% 28.90%