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Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 7,308,266 $ 6,938,009
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 6,560,731 $ 5,980,722