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Derivative financial instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of detailed information about financial instruments [abstract]  
Details of derivative instruments
The following is a summary, by maturity dates, of the Company’s forward contracts outstanding as at December 31, 2018:
 
 
2019

 
2020

 
Total

 
 
 
 
 
 
 
Forward – fuel oil:
 
 
 
 
 
 
Litres (thousands)
 
35,800

 
16,438

 
52,238

Average strike price
 
$
0.32

 
$
0.33

 
$
0.32

 
 
 
 
 
 
 
Forward – gas oil:
 
 
 
 
 
 
Litres (thousands)
 
19,383

 
7,598

 
26,981

Average strike price
 
$
0.43

 
$
0.51

 
$
0.45

 
 
 
 
 
 
 
Forward – diesel:
 
 
 
 
 
 
Litres (thousands)
 
2,856

 
1,599

 
4,455

Average strike price
 
$
0.50

 
$
0.57

 
$
0.53