Reinsurance - Effects of reinsurance on premiums written and earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reinsurance
Direct premiums, written	$ 462,179	$ 266,609
Ceded premiums, written	(399,400)	(237,102)
Net premiums, written	62,779	29,507
Direct premiums, earned	395,968	213,423
Ceded premiums, earned	(349,952)	(199,366)
Net premiums, earned	$ 46,016	$ 14,057