Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
20% of net unearned premiums	$ 67,285	$ 65,978
Discounting of loss reserves and salvage and subrogation recoverable for tax purposes	21,606	18,163
Expense accruals	11,578	12,997
Tax asset on net unrealized loss on securities carried at fair value	22,802	0
Other deferred tax assets	6,511	6,054
Total gross deferred tax assets	129,782	103,192
Deferred tax liabilities:
Deferred policy acquisition costs	(55,960)	(54,234)
Tax liability on net unrealized gain on securities carried at fair value	0	(70,808)
Tax depreciation in excess of book depreciation	(11,029)	(10,129)
Undistributed earnings of insurance subsidiaries	(1,898)	(3,557)
Tax amortization in excess of book amortization	(7,466)	(6,064)
Other deferred tax liabilities	(10,526)	(11,969)
Total gross deferred tax liabilities	(86,879)	(156,761)
Net deferred tax assets (liabilities)	$ 42,903
Net deferred tax assets (liabilities)		$ (53,569)