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Fair Value Measurements (Schedule of Fair Values of Financial Instruments and Nonfinancial Assets and Liabilities Measured at the Reporting Date) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets $ 2,868 $ 831
Derivatives liabilities 374 644
Fuel Hedge Contracts [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets 2,868  
Derivatives liabilities   638
Foreign Currency Exchange Hedge Contracts [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets   831
Derivatives liabilities $ 374 $ 6