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v3.21.1

Segment reporting - Geographic information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 569,501 | $ 668,414 | $ 650,187
Gross Premiums Written |  |  |
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 588,540 | $ 668,414 | $ 650,187
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
Gross Premiums Written | United States |  |  |
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 358,582 | $ 361,511 | $ 409,584
Concentration risk, percentage | 60.90% | 54.10% | 63.00%
Gross Premiums Written | United Kingdom |  |  |
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 110,576 | $ 161,638 | $ 60,623
Concentration risk, percentage | 18.80% | 24.20% | 9.30%
Gross Premiums Written | Bermuda |  |  |
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 108,598 | $ 137,278 | $ 86,236
Concentration risk, percentage | 18.50% | 20.50% | 13.30%
Gross Premiums Written | Other |  |  |
Revenue from External Customer [Line Items] |  |  |
Gross premiums written | $ 10,784 | $ 7,987 | $ 93,744
Concentration risk, percentage | 1.80% | 1.20% | 14.40%

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