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Pension Plans And Other Postretirement Benefit Plans (Schedule Of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plan And SERP [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 36,916
2019 37,613
2020 38,610
2021 38,729
2022 38,837
Total 2023-2027 205,395
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 6,856
2019 7,064
2020 6,093
2021 6,223
2022 6,288
Total 2023-2027 $ 32,265