Retirement Plans And Other Postretirement Benefits (Schedule Of Expected Benefit Payments For Continuing Operations) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2017	$ 17,593
2018	18,001
2019	18,205
2020	18,445
2021	18,511
2022-2026	90,778
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	17,100
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2017	481
2018	482
2019	478
2020	473
2021	468
2022-2026	2,196
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ (100)