Reinsurance - Effects of reinsurance on premiums written and earned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reinsurance
Direct premiums, written	$ 121,540	$ 124,914	$ 218,413	$ 212,037
Ceded premiums, written	(67,387)	(117,926)	(65,121)	(178,562)
Net premiums, written	54,153	6,988	153,292	33,475
Direct premiums, earned	116,397	93,082	231,221	177,400
Ceded premiums, earned	(72,166)	(83,095)	(146,840)	(154,822)
Net premiums, earned	$ 44,231	$ 9,987	$ 84,381	$ 22,578