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Other long-term obligations - Schedule of other long term obligations (Details) - CAD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities, Noncurrent [Abstract]
Directors' deferred stock unit plan	$ 10,761	$ 14,375
Deferred gain on sale-leaseback	4,748	6,593	$ 8,438
Other	3,341	3,536
Other long term obligations	$ 18,850	$ 24,504

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- Definition

Sale Leaseback, Deferred Gain, Net

+ References

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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