Reinsurance - Written and Earned Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Written Premiums
Direct	$ 823,318	$ 802,139	$ 798,712
Assumed	28,835	31,359	26,316
Ceded	(78,418)	(68,972)	(61,491)
Net written premiums	773,735	764,526	763,537
Earned Premiums
Direct	803,289	811,329	815,981
Assumed	28,976	30,583	29,365
Ceded	(73,760)	(67,584)	(74,268)
Net earned premiums	758,505	774,328	771,078
Loss and LAE
Direct	515,535	473,162	428,018
Assumed	18,627	16,873	18,595
Ceded	(42,183)	(28,308)	(42,057)
Net loss and LAE	$ 491,979	$ 461,727	$ 404,556