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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