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Fair Value Measurements (Narrative) (Details)
€ in Millions, gal in Millions
1 Months Ended 12 Months Ended
May 31, 2021
USD ($)
Dec. 31, 2024
USD ($)
Swap
$ / gal
gal
Dec. 31, 2023
USD ($)
€ / shares
Dec. 31, 2022
USD ($)
Dec. 31, 2023
EUR (€)
€ / shares
Derivatives Fair Value [Line Items]          
Debt instrument, face amount $ 325,000,000        
Maturity date Jun. 01, 2029        
Fair Value, Inputs, Level 1 [Member]          
Derivatives Fair Value [Line Items]          
Fair value of debt   $ 301,500,000      
Fuel Hedge Contracts [Member]          
Derivatives Fair Value [Line Items]          
Derivative underlying hedge percent   80.00%      
Derivative, nonmonetary notional amount, volume | gal   17.8      
Fair value hedge liabilities   $ 1,100,000 $ 2,900,000    
Reclassification of derivative gain (losses) to earnings net of tax   $ (1,593,000) (861,000) $ 10,629,000  
Fuel Hedge Contracts [Member] | Minimum [Member]          
Derivatives Fair Value [Line Items]          
Fixed price range | $ / gal   2.18      
Fuel Hedge Contracts [Member] | Maximum [Member]          
Derivatives Fair Value [Line Items]          
Fixed price range | $ / gal   2.9      
Foreign Currency Exchange Hedge Contracts [Member]          
Derivatives Fair Value [Line Items]          
Fair value hedge assets     358,000    
Reclassification of derivative gain (losses) to earnings net of tax   $ (208,000) 400,000 $ (116,000)  
Derivative notional amount | €         € 18.6
Reclassification of derivative (gains) losses to earnings net of cash settlements and taxes     $ 289,000    
Foreign Currency Exchange Hedge Contracts [Member] | Minimum [Member]          
Derivatives Fair Value [Line Items]          
Fixed price range | € / shares     1.01   1.01
Foreign Currency Exchange Hedge Contracts [Member] | Maximum [Member]          
Derivatives Fair Value [Line Items]          
Fixed price range | € / shares     1.13   1.13
Interest Rate Swaps [Member]          
Derivatives Fair Value [Line Items]          
Fair value hedge assets   217,000      
Reclassification of derivative gain (losses) to earnings net of tax   233,000      
Derivative notional amount   $ 75,000,000      
Number of interest rate swaps | Swap   2      
Derivative, maturity date   Aug. 24, 2026      
Derivative, average fixed interest rate   3.873%      
Floating-rate debt to weighted average fixed interest rate   11.623%