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Segment reporting - Broker Concentration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 134,230 | $ 95,388 | $ 82,637 | $ 319,591 | $ 120,063 | $ 30,064 | $ 49,765 | $ 378,360 | $ 631,846 | $ 578,252 | $ 641,620
Gross Premiums Written |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 631,846 | $ 578,252 | $ 641,620
Concentration risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 631,846 | $ 578,252 | $ 641,620
Concentration risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk | Largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 160,404 | $ 198,251 | $ 243,581
Concentration risk, percentage |  |  |  |  |  |  |  |  | 25.40% | 34.30% | 38.00%
Gross Premiums Written | Customer Concentration Risk | Second largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 150,377 | $ 157,542 | $ 128,648
Concentration risk, percentage |  |  |  |  |  |  |  |  | 23.80% | 27.20% | 20.10%
Gross Premiums Written | Customer Concentration Risk | Third largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 137,685 | $ 70,524 | $ 107,612
Concentration risk, percentage |  |  |  |  |  |  |  |  | 21.80% | 12.20% | 16.80%
Gross Premiums Written | Customer Concentration Risk | Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 183,380 | $ 151,935 | $ 161,779
Concentration risk, percentage |  |  |  |  |  |  |  |  | 29.00% | 26.30% | 25.10%

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