Retirement Plans And Other Postretirement Benefits (Schedule Of Pension Plan Assets Categorized By Level Within Fair Value Measurement Hierarchy) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Securities Sold And Interest Receivable	$ 259
Total plan assets	218,119	$ 244,612
Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		68,739
Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		16,588
International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		25,174
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	30,284	61,845
Private equity and hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	141	49,017
Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	10,250	6,868
Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	65,330	195,595
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	24,796	6,943
Contracts with Insurance Companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		9,438
Defined Benefit Plan, Common Collective Trust
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	152,389
Total investments measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	152,530
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	55,080	133,618
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		68,739
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		16,588
Quoted Prices in Active Markets for Identical Assets (Level 1) \| International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		25,174
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	30,284	9,306
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	6,868
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	24,796	6,943
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Contracts with Insurance Companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	52,539
Significant Other Observable Inputs (Level 2) \| Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Other Observable Inputs (Level 2) \| Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Other Observable Inputs (Level 2) \| International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Other Observable Inputs (Level 2) \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	52,539
Significant Other Observable Inputs (Level 2) \| Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Significant Other Observable Inputs (Level 2) \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Significant Other Observable Inputs (Level 2) \| Contracts with Insurance Companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	10,250	9,438
Significant Unobservable Inputs (Level 3) \| Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Unobservable Inputs (Level 3) \| Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Unobservable Inputs (Level 3) \| International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		0
Significant Unobservable Inputs (Level 3) \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Significant Unobservable Inputs (Level 3) \| Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	10,250	0
Significant Unobservable Inputs (Level 3) \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	$ 0	0
Significant Unobservable Inputs (Level 3) \| Contracts with Insurance Companies
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		$ 9,438