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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
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets $ 831 $ 630
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Assets Assets
Derivatives liabilities $ 644  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Liabilities Liabilities
Fuel Hedge Contracts [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets   $ 630
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 $ 6