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Derivative financial instruments (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of detailed information about financial instruments [abstract]  
Details of derivative instruments
The following is a summary, by maturity dates, of the Company’s fuel derivative contracts outstanding as at December 31, 2021:
                                         
    2022   2023   Total
             
Forward – fuel oil:            
Litres (thousands)   51,884      21,292      73,176   
Average strike price   $ 0.32      $ 0.37      $ 0.33   
             
Forward – gas oil:            
Litres (thousands)   40,171      17,066      57,237   
Average strike price   $ 0.37      $ 0.43      $ 0.39