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Other long term obligations - Schedule of other long term obligations (Details) - CAD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Directors' deferred stock unit plan	$ 14,375	$ 13,413
Deferred gain on sale-leaseback	6,593	8,438	$ 7,654
Other	3,536	2,353
Deferred lease inducements liability	0	1,419
Other long term obligations	$ 24,504	$ 25,623

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- Definition

Lease Incentive Payable, Noncurrent

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- Definition

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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The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period.

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