Retirement Plans And Other Postretirement Benefits (Schedule Of Amounts Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income That Are Expected To Be Recognized As Components Of Net Periodic Benefit Or Cost) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit)	$ 0
Net actuarial (gain) loss	10,916
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit)	0
Net actuarial (gain) loss	$ (230)