Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Insurance Earned Premiums
Gross Amount	$ 811,329	$ 815,981	$ 845,102
Ceded to Other Companies	67,584	74,268	89,178
Assumed from Other Companies	30,583	29,365	32,853
Net Amount	774,328	771,078	788,777
Property and Casualty Insurance
Insurance Earned Premiums
Gross Amount	811,329	815,981	845,102
Ceded to Other Companies	67,584	74,268	89,178
Assumed from Other Companies	30,583	29,365	32,853
Net Amount	$ 774,328	$ 771,078	$ 788,777
Percentage of Amount Assumed to Net	3.90%	3.80%	4.20%