Reinsurance - Written and Earned Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Written Premiums
Direct	$ 802,139	$ 798,712	$ 852,404
Assumed	31,359	26,316	32,391
Ceded	(68,972)	(61,491)	(90,386)
Net written premiums	764,526	763,537	794,409
Earned Premiums
Direct	811,329	815,981	845,102
Assumed	30,583	29,365	32,853
Ceded	(67,584)	(74,268)	(89,178)
Net earned premiums	774,328	771,078	788,777
Loss and LAE Incurred
Direct	473,162	428,018	562,192
Assumed	16,873	18,595	28,529
Ceded	(28,308)	(42,057)	(80,875)
Net loss and LAE	$ 461,727	$ 404,556	$ 509,846