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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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