Retirement Plans (Schedule Of Allocation Of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Weighted Average Expected Long-term Rates of Return	5.25%	5.25%	5.50%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Expected Long-term Rates of Return	4.80%	3.30%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted Average Expected Long-term Rates of Return	6.30%	4.80%
Defined Benefit Plan, Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.30%	0.30%
Defined Benefit Plan, Cash [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Defined Benefit Plan, Cash [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	1.00%	1.00%
Equity Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	24.80%	28.20%
Equity Mutual Funds [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	20.00%	20.00%
Weighted Average Expected Long-term Rates of Return	6.30%	5.30%
Equity Mutual Funds [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%	30.00%
Weighted Average Expected Long-term Rates of Return	8.80%	7.70%
Fixed Income Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	74.90%	71.50%
Fixed Income Mutual Funds [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%	70.00%
Weighted Average Expected Long-term Rates of Return	4.30%	2.50%
Fixed Income Mutual Funds [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	80.00%	80.00%
Weighted Average Expected Long-term Rates of Return	5.60%	3.70%