Schedule IV. Reinsurance (Details) - Property and casualty business - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross Amount	$ 889,301	$ 978,190	$ 1,106,327
Ceded to Other Companies	101,740	92,650	84,924
Assumed From Other Companies	163,980	77,283	33,679
Net Amount	$ 951,541	$ 962,823	$ 1,055,082
Percentage of Amount Assumed to Net Earned	17.23%	8.03%	3.19%