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, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Contracts with insurance companies	$ 9,899	$ 10,495
Total plan assets	205,367	226,354
Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	37,323	42,920
Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	13,880	14,477
International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	32,931	34,153
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	17,769	17,513
Private equity and hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	86,786	100,974
Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	6,779	5,822
Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	108,682	114,885
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	77,257	85,002
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	37,323	42,920
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	13,880	14,477
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	13,389	16,409
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	5,886	5,374
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	6,779	5,822
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	31,425	29,883
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	19,542	17,744
Significant Other Observable Inputs (Level 2) | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	11,883	12,139
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