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Segment reporting - Broker Concentration (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, Major 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, Major Customer [Line Items]
Gross premiums written									$ 631,846	$ 578,252	$ 641,620
Concentration risk, percentage									100.00%	100.00%	100.00%
Gross Premiums Written | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Gross premiums written									$ 631,846	$ 578,252	$ 641,620
Concentration risk, percentage									100.00%	100.00%	100.00%
Gross Premiums Written | Customer Concentration Risk | Largest broker
Revenue, Major Customer [Line Items]
Gross premiums written									$ 160,404	$ 198,251	$ 243,581
Concentration risk, percentage									25.40%	34.30%	38.00%
Gross Premiums Written | Customer Concentration Risk | Second largest broker
Revenue, Major Customer [Line Items]
Gross premiums written									$ 150,377	$ 157,542	$ 128,648
Concentration risk, percentage									23.80%	27.20%	20.10%
Gross Premiums Written | Customer Concentration Risk | Third largest broker
Revenue, Major Customer [Line Items]
Gross premiums written									$ 137,685	$ 70,524	$ 107,612
Concentration risk, percentage									21.80%	12.20%	16.80%
Gross Premiums Written | Customer Concentration Risk | Other
Revenue, Major Customer [Line Items]
Gross premiums written									$ 183,380	$ 151,935	$ 161,779
Concentration risk, percentage									29.00%	26.30%	25.10%

X

- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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