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Segment reporting - Geographic information (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 from External Customer [Line Items] |  |  |  |
Gross premiums written | $ 145,508 | $ 98,215 | $ 233,095 | $ 194,235
Gross Premiums Written |  |  |  |
Revenue from External 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 | United States |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | 144,657 | 93,992 | 202,734 | 143,650
Concentration risk, percentage | 99.40% | 95.70% | 87.00% | 74.00%
Gross Premiums Written | United Kingdom |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | 575 | 0 | 25,413 | 0
Concentration risk, percentage | 0.40% | 0.00% | 10.90% | 0.00%
Gross Premiums Written | Bermuda |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | 276 | 4,223 | 4,948 | 49,185
Concentration risk, percentage | 0.20% | 4.30% | 2.10% | 25.30%
Gross Premiums Written | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | $ 0 | $ 0 | $ 0 | $ 1,400
Concentration risk, percentage | 0.00% | 0.00% | 0.00% | 0.70%

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