Reinsurance - Effects of reinsurance on premiums written and earned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reinsurance
Direct premiums, written	$ 124,914	$ 81,132	$ 212,037	$ 81,132
Ceded premiums, written	(117,926)	(70,844)	(178,562)	(70,844)
Net premiums, written	6,988	10,288	33,475	10,288
Direct premiums, earned	93,082	62,352	177,400	62,352
Ceded premiums, earned	(83,095)	(59,077)	(154,822)	(59,077)
Net premiums, earned	$ 9,987	$ 3,275	$ 22,578	$ 3,275