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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, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets $ 218,329 $ 205,367
Large/mid-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 46,440 37,323
Small-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 17,135 13,880
International and emerging market equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 43,079 32,931
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 18,911 17,769
Defined Benefit Plan, Estimated Future Retirement Benefits Covered by Insurance Contract, Amount   9,899
Contracts with insurance companies 8,840  
Private equity and hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 76,339 86,786
Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 7,585 6,779
Total Plan Assets at Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 141,990 118,581
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 96,486 77,257
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 46,440 37,323
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 17,135 13,880
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 19,117 13,389
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 6,209 5,886
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimate of Fair Value Measurement [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Estimated Future Retirement Benefits Covered by Insurance Contract, Amount   0
Contracts with insurance companies 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 7,585 6,779
Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 36,664 31,425
Significant Other Observable Inputs (Level 2) | Large/mid-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 0 0
Significant Other Observable Inputs (Level 2) | Small-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 0 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 23,962 19,542
Significant Other Observable Inputs (Level 2) | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 12,702 11,883
Significant Other Observable Inputs (Level 2) | Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 0 0
Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 8,840 9,899
Defined Benefit Plan, Estimated Future Retirement Benefits Covered by Insurance Contract, Amount   9,899
Contracts with insurance companies 8,840  
Significant Unobservable Inputs (Level 3) | Large/mid-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 0 0
Significant Unobservable Inputs (Level 3) | Small-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 0 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 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 $ 0 $ 0