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NET INCOME (LOSS) PER SHARE - Disclosure of net income (loss) per share (Details) - CAD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Earnings per share [abstract]    
Net income (loss) $ (13,820) $ 62,118
Weighted average number of common shares outstanding - basic 81,801,575 79,979,320
Dilutive effect of stock options and warrants outstanding 0 674,154
Weighted average number of common shares outstanding - diluted 81,801,575 80,653,474
Basic earnings (loss) per share $ (0.17) $ 0.78
Diluted earnings (loss) per share $ (0.17) $ 0.77