Reinsurance - Premiums Written and Earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of the effect of reinsurance on premiums written and earned
Direct premiums written	$ 912,387	$ 814,298	$ 919,799
Assumed premiums written	47,637	40,124	47,691
Ceded premiums written	(77,303)	(106,721)	(124,765)
Net premiums written	882,721	747,701	842,725
Direct premiums earned	1,020,107	862,742	926,035
Assumed premiums earned	45,559	43,555	45,668
Ceded premiums earned	(93,998)	(113,582)	(124,171)
Net premiums earned	971,668	792,715	847,532
Losses and loss adjustment expenses	798,893	741,719	871,780
Reinsurance recoveries	(46,644)	(80,272)	(117,865)
Net losses and loss adjustment expenses	$ 752,249	$ 661,447	$ 753,915