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Financial instruments and risk management (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial Instruments And Risk Management      
Fuel increase operating cost $ 0.01    
Fuel sensitivity analysis, increase in operating costs due to reasonably possible increase in price per gallon $ 3,227 $ 3,719 $ 3,399
Fuel decrease operating cost $ 0.01    
Fuel sensitivity analysis, increase in operating costs due to reasonably possible decrease in price per gallon $ (3,227) $ (3,719) $ (3,399)