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Financial instruments and risk management (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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)

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