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Share capital - Disclosure of dividends (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |
Dividend payable | $ 7,874 | $ 7,779
February 20, 2019 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share | $ 0.05 |
Dividend payable | $ 7,757,000 |
Shares issued under dividend reinvestment plan | 5,087,058 |
May 1, 2019 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share | $ 0.05 |
Dividend payable | $ 7,145,000 |
Shares issued under dividend reinvestment plan | 8,157,756 |
July 31, 2019 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share | $ 0.05 |
Dividend payable | $ 7,200,000 |
Shares issued under dividend reinvestment plan | 5,672,755 |
November 6, 2019 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share | $ 0.05 |
Dividend payable | $ 7,874,000 |
Shares issued under dividend reinvestment plan | 6,666,723 |
Year 2019 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share | $ 0.20 |
Dividend payable | $ 29,976,000 |
February 16, 2018 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share |  | $ 0.05
Dividend payable |  | $ 7,811,000
Shares issued under dividend reinvestment plan |  | 27,302,917
May 3, 2018 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share |  | $ 0.05
Dividend payable |  | $ 7,811,000
Shares issued under dividend reinvestment plan |  | 8,097,787
August 2, 2018 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share |  | $ 0.05
Dividend payable |  | $ 7,812,000
Shares issued under dividend reinvestment plan |  | 28,065,085
November 6, 2018 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share |  | $ 0.05
Dividend payable |  | $ 7,779,000
Shares issued under dividend reinvestment plan |  | 29,627,597
Year 2018 [Member] |  |
Disclosure of classes of share capital [line items] |  |
Dividend per share |  | $ 0.20
Dividend payable |  | $ 31,213,000

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