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Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, including current maturities, Carrying amount $ 1,008,516 $ 1,139,287
Fair Value, Inputs, Level 2 [Member]    
Debt Instrument [Line Items]    
Long-term debt, including current maturities, Fair value $ 896,982 $ 1,178,066