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Segment reporting - Business Line (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
Property and Casualty Reinsurance
Revenue, Major Customer [Line Items]
Gross premiums written									$ 631,846	$ 578,252	$ 641,620
Gross Premiums As Percentage Of Total Gross Premiums									100.00%	100.00%	100.00%
Property and Casualty Reinsurance | Property
Revenue, Major Customer [Line Items]
Gross premiums written									$ 144,271	$ 9,070	$ 136,999
Gross Premiums As Percentage Of Total Gross Premiums									22.80%	1.60%	21.40%
Property and Casualty Reinsurance | Casualty
Revenue, Major Customer [Line Items]
Gross premiums written									$ 151,893	$ 235,789	$ 269,759
Gross Premiums As Percentage Of Total Gross Premiums									24.00%	40.80%	42.00%
Property and Casualty Reinsurance | Specialty
Revenue, Major Customer [Line Items]
Gross premiums written									$ 248,044	$ 259,173	$ 125,511
Gross Premiums As Percentage Of Total Gross Premiums									39.30%	44.80%	19.60%
Property and Casualty Reinsurance | Total prospective reinsurance contracts
Revenue, Major Customer [Line Items]
Gross premiums written									$ 544,208	$ 504,032	$ 532,269
Gross Premiums As Percentage Of Total Gross Premiums									86.10%	87.20%	83.00%
Property and Casualty Reinsurance | Retroactive reinsurance contracts
Revenue, Major Customer [Line Items]
Gross premiums written									$ 87,638	$ 74,220	$ 109,351
Gross Premiums As Percentage Of Total Gross Premiums									13.90%	12.80%	17.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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