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Segment reporting - Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 441,935 | $ 478,452
Customer Concentration Risk | Reinsurance Receivables |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 441,935 | $ 478,452
Concentration risk, percentage | 100.00% | 100.00%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 1 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 94,131 | $ 113,718
Concentration risk, percentage | 21.30% | 23.80%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 2 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 75,336 | $ 105,732
Concentration risk, percentage | 17.00% | 22.00%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 3 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 46,447 | $ 88,825
Concentration risk, percentage | 10.50% | 18.60%
Customer Concentration Risk | Reinsurance Receivables | Customers contributing greater than 10% each |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 215,914 | $ 308,275
Concentration risk, percentage | 48.80% | 64.40%
Customer Concentration Risk | Reinsurance Receivables | Other counterparties representing less than 10% each |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable, net | $ 226,021 | $ 170,177
Concentration risk, percentage | 51.20% | 35.60%

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