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Fair Value Measurements (Narrative) (Details)
gal in Millions
1 Months Ended 12 Months Ended
May 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
$ / gal
€ / shares
gal
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
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   $ 276,315,000    
Fuel Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Derivative underlying hedge percent   80.00%    
Derivative, Nonmonetary Notional Amount, Volume | gal   13.0    
Fair value hedge liabilities   $ 2,918,000 $ 638,000  
Reclassification of derivative (gains) losses to earnings net of tax   $ 861,000 10,629,000 $ 6,481,000
Fuel Hedge Contracts [Member] | Minimum [Member]        
Derivatives Fair Value [Line Items]        
Fixed price range | $ / gal   2.35    
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 liabilities   $ 0 6,000  
Fair value hedge assets   358,000 831,000  
Reclassification of derivative (gains) losses to earnings net of tax   400,000 (116,000)  
Derivative notional amount   18,600,000    
Reclassification of derivative (gains) losses to earnings net of cash settlements and taxes   $ (289,000) $ 155,000  
Foreign Currency Exchange Hedge Contracts [Member] | Minimum [Member]        
Derivatives Fair Value [Line Items]        
Fixed price range | € / shares   1.01    
Foreign Currency Exchange Hedge Contracts [Member] | Maximum [Member]        
Derivatives Fair Value [Line Items]        
Fixed price range | € / shares   1.13