Pension Plans And Other Post-Retirement Benefits (Schedule Of Accumulated And Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 16,041	$ 23,601
Accumulated benefit obligation	12,126	17,129
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	29,009	42,463
Fair value of plan assets	$ 12,064	$ 11,616