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Derivative financial instruments (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019:
 
 
2020

 
2021

 
Total

 
 
 
 
 
 
 
Forward – fuel oil:
 
 
 
 
 
 
Litres (thousands)
 
16,438

 
—

 
16,438

Average strike price
 
$
0.33

 
$
—

 
$
0.33

 
 
 
 
 
 
 
Forward – gas oil:
 
 
 
 
 
 
Litres (thousands)
 
21,908

 
1,717

 
23,625

Average strike price
 
$
0.49

 
$
0.49

 
$
0.49

 
 
 
 
 
 
 
Forward – diesel:
 
 
 
 
 
 
Litres (thousands)
 
1,599

 
—

 
1,599

Average strike price
 
$
0.57

 
$
—

 
$
0.57

 
 
 
 
 
 
 
Collars - fuel oil
 
 
 
 
 
 
Litres (thousand)
 
19,783

 
11,055

 
30,838

Average ceiling price
 
$
0.26

 
$
0.26

 
$
0.26

Average floor price
 
$
0.39

 
$
0.39

 
$
0.39

 
 
 
 
 
 
 
Collars - diesel
 
 
 
 
 
 
Litres (thousand)
 
6,439

 
6,439

 
12,878

Average ceiling price
 
$
0.40

 
$
0.40

 
$
0.40

Average floor price
 
$
0.57

 
$
0.57

 
$
0.57