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, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Contracts with insurance companies	$ 10,158	$ 10,207
Total plan assets	214,558	210,642
Large/mid-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	31,549	29,027
Small-capitalization equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	11,389	8,457
International and emerging market equity securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	24,710	23,054
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	17,213	22,968
Private equity and hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	103,686	110,340
Fixed Income Security NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value		3,862
Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	15,853	2,727
Total Plan Assets at Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	100,714	86,233
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	74,642	60,963
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	31,549	29,027
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	11,389	8,457
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	11,410	10,126
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	4,441	10,626
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other assets
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	15,853	2,727
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	26,072	25,270
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	13,300	12,928
Significant Other Observable Inputs (Level 2) \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	12,772	12,342
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