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Segment reporting - Geographic information (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 from External Customer [Line Items] |  |  |  |
Gross premiums written | $ 126,403 | $ 45,425 | $ 359,498 | $ 239,660
Gross Premiums Written |  |  |  |
Revenue from External 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 | United States |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | 85,686 | 7,665 | 288,420 | 151,314
Concentration risk, percentage | 67.70% | 16.90% | 80.30% | 63.10%
Gross Premiums Written | United Kingdom |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | (812) | 0 | 24,600 | 0
Concentration risk, percentage | (0.60%) | 0.00% | 6.80% | 0.00%
Gross Premiums Written | Bermuda |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gross premiums written | 41,529 | 37,760 | 46,478 | 86,946
Concentration risk, percentage | 32.90% | 83.10% | 12.90% | 36.30%
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% | 0.60%

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