General (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Common stock dividends (in dollars per share)	$ 0.3175	$ 0.6325	$ 1.5875	$ 1.8975
Deferred policy acquisition cost amortization	$ 168,870,000	$ 153,142,000	$ 487,444,000	$ 468,556,000
Advertising expenses	2,300,000	19,400,000	10,000,000	40,700,000
Reinsurance reimbursable amount	25,000,000		$ 25,000,000
Reinsurance Retention Policy, Reinsured Risk, Percentage			73.50%
Reinsurance retention policy, excess retention, amount reinsured			$ 936,000,000
Reinsurance policy, amount retained			60,000,000
Ceded	23,000,000	17,000,000	57,000,000	48,000,000
Losses and loss adjustment expenses, ceded	(2,000,000)	(1,000,000)	(15,000,000)	(4,000,000)
Revenue from contract with customer	4,500,000	4,600,000	13,500,000	15,900,000
Cost of goods and services sold	2,500,000	$ 3,000,000	8,000,000	$ 9,900,000
Contract with customer, asset	0		0		$ 0
Contract with customer, liability	0		0		0
Revenue, remaining performance obligation	$ 0		$ 0		$ 0
Potentially dilutive securities (in shares)	18,000	0		0
Incremental shares excluded from diluted earnings per share (in shares)			1,294