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Segment reporting - Broker Concentration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 190,358 | $ 124,737 | $ 147,740 | $ 125,705 | $ 191,203 | $ 184,856 | $ 149,035 | $ 143,320 | $ 588,540 | $ 668,414 | $ 650,187
Gross Premiums Written |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Gross Premiums Written | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 588,540 | $ 668,414 | $ 650,187
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 |  |  |  |  |  |  |  |  | $ 189,097 | $ 197,100 | $ 224,198
Concentration risk, percentage |  |  |  |  |  |  |  |  | 32.10% | 29.50% | 34.50%
Gross Premiums Written | Customer Concentration Risk | Second largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 164,569 | $ 144,611 | $ 163,336
Concentration risk, percentage |  |  |  |  |  |  |  |  | 28.00% | 21.60% | 25.10%
Gross Premiums Written | Customer Concentration Risk | Third largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 67,550 | $ 140,197 | $ 120,381
Concentration risk, percentage |  |  |  |  |  |  |  |  | 11.50% | 21.00% | 18.50%
Gross Premiums Written | Customer Concentration Risk | Fourth largest broker |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  |  |  | $ 70,523
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  | 10.80%
Gross Premiums Written | Customer Concentration Risk | Other |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 167,324 | $ 186,506 | $ 71,749
Concentration risk, percentage |  |  |  |  |  |  |  |  | 28.40% | 27.90% | 11.10%

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