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Financial instruments and risk management - Fuel Sensitivity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Financial instruments and risk management |  |
+ US$0.01 per gallon | $ 0.01 | $ 0.01
- US$0.01 per gallon | $ 0.01 | $ 0.01
Increase in Operating costs | $ 2,731 | $ 1,762
Decrease in Operating costs | $ (2,731) | $ (1,762)

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