Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Net Realized Investment Gains (Losses)	$ 47,383	$ (32,395)	$ 53,779
Claims and Claim Adjustment Expenses Incurred Related to: Current Year	701,064	887,119	835,507
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years	48,909	17,652	5,335
Consolidated Property and Casualty Insurance Entity
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Deferred Policy Acquisition Costs	91,446	87,094	94,292
Reserves for Unpaid Claims and Claim Adjustment Expenses	1,514,265	1,578,131	1,421,754
Unearned Premiums	439,733	464,845	505,162
Earned Premiums	962,823	1,055,082	1,086,972
Net Realized Investment Gains (Losses)	47,383	(32,395)	53,779
Net Investment Income	55,778	39,670	60,414
Claims and Claim Adjustment Expenses Incurred Related to: Current Year	691,933	887,119	835,507
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years	39,778	(17,652)	(5,335)
Amortization of Deferred Policy Acquisition Costs	203,432	210,252	216,699
Paid Claims and Claim Adjustment Expenses	697,078	776,397	732,343
Premiums Written	$ 941,348	$ 1,011,350	$ 1,096,730