General - Effects of Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Premiums Written
Direct	$ 1,018,600	$ 1,018,200
Premiums Earned
Ceded	23,000	17,000
Net	1,004,704	962,550
Property & Casualty
Premiums Written
Direct	1,012,238	1,011,385
Ceded	(23,391)	(17,601)
Assumed	15,031	10,165
Net	1,003,878	1,003,949
Premiums Earned
Direct	1,016,870	970,163
Ceded	(23,198)	(17,462)
Assumed	3,890	2,717
Net	$ 997,562	$ 955,418