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Financial Instruments (Carrying Value, Fair Value And Hierarchy Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments of deferred compensation plans held in trust $ 104,410 $ 93,196
Long-term debt and current portion of long-term debt   97,500
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments of deferred compensation plans held in trust $ 104,410 93,196
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt and current portion of long-term debt   $ 97,500