Reinsurance - Effects of reinsurance on premiums written and earned (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reinsurance
Direct premiums, written	$ 96,873	$ 87,123
Ceded premiums, written		(60,636)
Ceded premiums, written	2,266
Net premiums, written	99,139	26,487
Direct premiums, earned	114,824	84,318
Ceded premiums, earned	(74,674)	(71,727)
Net premiums, earned	$ 40,150	$ 12,591