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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, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Contracts with insurance companies $ 10,495 $ 10,158
Total plan assets 226,354 214,558
Large/mid-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 42,920 31,549
Small-capitalization equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 14,477 11,389
International and emerging market equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 34,153 24,710
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 17,513 17,213
Private equity and hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 100,974 103,686
Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 5,822 15,853
Total Plan Assets at Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 114,885 100,714
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 85,002 74,642
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 42,920 31,549
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 14,477 11,389
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 16,409 11,410
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 5,374 4,441
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other assets    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 5,822 15,853
Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 29,883 26,072
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 17,744 13,300
Significant Other Observable Inputs (Level 2) | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total plan assets at fair value 12,139 12,772
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 0 0
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