Retirement Plans And Other Postretirement Benefits (Schedule Of Pension Plan Assets Categorized By Level Within Fair Value Measurement Hierarchy) (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Securities Sold And Interest Receivable	$ 259
Total plan assets	218,119
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	24,796
Fixed income mutual fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	30,284
Defined Benefit Plan, Common Collective Trust
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	152,389
Private equity and hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	141
Other Assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	10,250
Total investments measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	152,530
Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	65,330
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	24,796
Level 1 | Fixed income mutual fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	30,284
Level 1 | Other Assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 1 | Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	55,080
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 2 | Fixed income mutual fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 2 | Other Assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 2 | Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 3 | Fixed income mutual fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0
Level 3 | Other Assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	10,250
Level 3 | Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	$ 10,250