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Derivative financial instruments - Schedule of Forward Contracts, Fuel Oil, Gas Oil and Diesel (Details) - Forward contracts
l in Thousands
Dec. 31, 2018
$ / l
l
2019 | Forward – fuel oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 35,800
Average price per litre (in usd per litre) | $ / l 0.32
2019 | Forward – gas oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 19,383
Average price per litre (in usd per litre) | $ / l 0.43
2019 | Forward – diesel:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 2,856
Average price per litre (in usd per litre) | $ / l 0.50
2020 | Forward – fuel oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 16,438
Average price per litre (in usd per litre) | $ / l 0.33
2020 | Forward – gas oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 7,598
Average price per litre (in usd per litre) | $ / l 0.51
2020 | Forward – diesel:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 1,599
Average price per litre (in usd per litre) | $ / l 0.57
Total | Forward – fuel oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 52,238
Average price per litre (in usd per litre) | $ / l 0.32
Total | Forward – gas oil:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 26,981
Average price per litre (in usd per litre) | $ / l 0.45
Total | Forward – diesel:  
Disclosure of detailed information about financial instruments [line items]  
Forward fuel contracts | l 4,455
Average price per litre (in usd per litre) | $ / l 0.53