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Segment reporting - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Gross premiums written	$ 134,230	$ 95,388	$ 82,637	$ 319,591	$ 120,063	$ 30,064	$ 49,765	$ 378,360	$ 631,846	$ 578,252	$ 641,620
Gross Premiums Written
Revenue from External Customer [Line Items]
Gross premiums written									$ 631,846	$ 578,252	$ 641,620
Concentration risk, percentage									100.00%	100.00%	100.00%
Gross Premiums Written | United States
Revenue from External Customer [Line Items]
Gross premiums written									$ 326,987	$ 326,261	$ 352,539
Concentration risk, percentage									51.80%	56.40%	54.90%
Gross Premiums Written | United Kingdom
Revenue from External Customer [Line Items]
Gross premiums written									$ 154,909	$ 63,619	$ 203,768
Concentration risk, percentage									24.50%	11.00%	31.80%
Gross Premiums Written | Bermuda
Revenue from External Customer [Line Items]
Gross premiums written									$ 142,246	$ 93,406	$ 62,234
Concentration risk, percentage									22.50%	16.20%	9.70%
Gross Premiums Written | Other
Revenue from External Customer [Line Items]
Gross premiums written									$ 7,704	$ 94,966	$ 23,079
Concentration risk, percentage									1.20%	16.40%	3.60%

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