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Segment reporting - Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 596,120 | $ 602,448
Customer Concentration Risk | Reinsurance Receivables |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 596,120 | $ 602,448
Concentration risk, percentage | 100.00% | 100.00%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 1 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 114,252 | $ 86,155
Concentration risk, percentage | 19.20% | 14.30%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 2 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 105,992 | $ 83,079
Concentration risk, percentage | 17.80% | 13.80%
Customer Concentration Risk | Reinsurance Receivables | Counterparty 3 |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 88,895 | $ 69,641
Concentration risk, percentage | 14.90% | 11.60%
Customer Concentration Risk | Reinsurance Receivables | Customers contributing greater than 10% each |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 309,139 | $ 238,875
Concentration risk, percentage | 51.90% | 39.70%
Customer Concentration Risk | Reinsurance Receivables | Other counterparties representing less than 10% each |  |
Concentration Risk [Line Items] |  |
Reinsurance balances receivable | $ 286,981 | $ 363,573
Concentration risk, percentage | 48.10% | 60.30%

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