Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Net Realized Investment Gains (Losses)	$ (15,892)	$ 47,383	$ (32,395)
Claims and Claim Adjustment Expenses Incurred Related to: Current Year	624,411	701,064	887,119
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years	(12,890)	48,909	17,652
Consolidated Property and Casualty Insurance Entity
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Deferred Policy Acquisition Costs	104,225	91,446	87,094
Reserves for Unpaid Claims and Claim Adjustment Expenses	1,497,274	1,514,265	1,578,131
Unearned Premiums	474,388	439,733	464,845
Earned Premiums	951,541	962,823	1,055,082
Net Realized Investment Gains (Losses)	(15,892)	47,383	(32,395)
Net Investment Income	44,932	55,778	39,670
Claims and Claim Adjustment Expenses Incurred Related to: Current Year	624,411	691,933	887,119
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years	12,890	(39,778)	(17,652)
Amortization of Deferred Policy Acquisition Costs	213,075	203,432	210,252
Paid Claims and Claim Adjustment Expenses	688,268	697,078	776,397
Premiums Written	$ 984,223	$ 941,348	$ 1,011,350