General - Effects of Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Premiums Written
Direct	$ 1,034,100	$ 972,900	$ 2,052,300	$ 1,926,300
Premiums Earned
Ceded	17,000	16,000	35,000	31,000
Net	987,512	926,820	1,950,062	1,842,741
Property & Casualty
Premiums Written
Direct	1,025,749	963,418	2,037,134	1,910,024
Ceded	(17,370)	(15,785)	(34,971)	(31,428)
Assumed	279	218	10,444	12,887
Net	1,008,658	947,851	2,012,607	1,891,483
Premiums Earned
Direct	994,659	931,833	1,964,822	1,852,900
Ceded	(17,097)	(15,617)	(34,559)	(31,160)
Assumed	2,742	3,299	5,459	6,590
Net	$ 980,304	$ 919,515	$ 1,935,722	$ 1,828,330