Income Taxes (Schedule Of Additional Information Related To Unrecognized Uncertain Tax Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax, other noncurrent liability accounts, or deferred tax assets in the balance sheet)	$ 659	$ 628	$ 648	$ 628
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet)	98	143	48
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized	757	771	696
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	169	149	133
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $20, $16 and $26 reflected in income tax expense in the income statement in 2023, 2022 and 2021, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet)	20	16	26
Related deferred income tax assets recognized on interest and penalties	(39)	(34)	(31)
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized	130	115	102
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized	$ 887	$ 886	$ 798