Reinsurance - Effects of reinsurance on premiums written and earned (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reinsurance
Direct premiums, written	$ 137,047	$ 96,201	$ 349,084	$ 177,333
Ceded premiums, written	(119,131)	(87,949)	(297,693)	(158,793)
Net premiums, written	17,916	8,252	51,391	18,540
Direct premiums, earned	105,245	72,360	282,645	134,712
Ceded premiums, earned	(93,982)	(67,666)	(248,804)	(126,743)
Net premiums, earned	$ 11,263	$ 4,694	$ 33,841	$ 7,969