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Pension Plans And Other Postretirement Benefit Plans (Schedule Of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan And SERP [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 39,647
2021 40,080
2022 40,652
2023 40,729
2024 41,767
Total 2025-2029 217,899
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 6,442
2021 6,782
2022 6,965
2023 7,088
2024 7,244
Total 2025-2029 $ 38,305