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Debt And Credit Agreements (Summary Of Total Debt Due And Outstanding) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
December 2023
Debt Instrument [Line Items]
Minimum EBITDA	$ 21,070
January 2024
Debt Instrument [Line Items]
Minimum EBITDA	21,110
February 2024
Debt Instrument [Line Items]
Minimum EBITDA	18,750
March 2024
Debt Instrument [Line Items]
Minimum EBITDA	16,640
April 2024
Debt Instrument [Line Items]
Minimum EBITDA	19,780
May 2024
Debt Instrument [Line Items]
Minimum EBITDA	19,660
June 2024
Debt Instrument [Line Items]
Minimum EBITDA	19,450
July 2024
Debt Instrument [Line Items]
Minimum EBITDA	21,860
August 2024
Debt Instrument [Line Items]
Minimum EBITDA	22,830
September 2024
Debt Instrument [Line Items]
Minimum EBITDA	25,370
October 2024
Debt Instrument [Line Items]
Minimum EBITDA	26,070
November 2024
Debt Instrument [Line Items]
Minimum EBITDA	27,640
December 2024
Debt Instrument [Line Items]
Minimum EBITDA	29,640
January 2025
Debt Instrument [Line Items]
Minimum EBITDA	29,740
February 2025
Debt Instrument [Line Items]
Minimum EBITDA	29,850
March 2025
Debt Instrument [Line Items]
Minimum EBITDA	$ 29,980

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