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Share capital - Disclosure of objectives, policies and processes for managing capital (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of classes of share capital [line items] |  |  |
Long-term debt | $ 349,042 | $ 352,769 | $ 464,308
Total equity | 1,493,446 | 1,771,595 | $ 1,894,405
Undrawn revolving credit facility | 380,518 | 320,000 |
Total capital | $ 2,223,006 | $ 2,444,364 |

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