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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of all premiums and other types of receivables due from other persons or entities.

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