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Schedule IV - Reinsurance (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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded to other companies	$ 5,964	$ 1,116	$ 1,473	$ 712	$ 1,770	$ 0	$ 3,479	$ 14,646	$ 9,265	$ 19,895	$ 2,475
Assumed from other companies	134,230	95,388	82,637	319,591	120,063	30,064	49,765	378,360	631,846	578,252	641,620
Net premiums written	$ 128,266	$ 94,272	$ 81,164	$ 318,879	$ 118,293	$ 30,064	$ 46,286	$ 363,714	622,581	558,357	639,145
Property and Casualty Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct gross premiums written									0	0	0
Ceded to other companies									9,265	19,895	2,475
Assumed from other companies									631,846	578,252	641,620
Net premiums written									$ 622,581	$ 558,357	$ 639,145
Percentage of amount assumed to net									99.00%	97.00%	100.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of written premiums assumed from other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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Percentage of assumed premium earned to premium earned after effects of reinsurance, as disclosed in supplementary reinsurance information.

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-Publisher FASB
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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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