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Consolidated statements of earnings - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Consolidated statements of earnings [Abstract]    
Revenue from products and services $ 1,800,073 $ 1,862,925
Cost of products and services sold 1,484,962 1,345,551
Depreciation and amortization 208,662 275,749
Cost of sales 1,693,624 1,621,300
Gross profit 106,449 241,625
Administration 145,344 124,869
Exploration 10,873 13,686
Research and development 3,965 6,058
Other operating expense 23,921 2,732
Loss on disposal of assets 1,072 1,869
Earnings (loss) from operations (78,726) 92,411
Finance costs (96,133) (98,622)
Gain (loss) on derivatives 36,577 32,269
Finance income 10,835 29,760
Share of earnings from equity-accounted investee 36,476 45,360
Other income (expense) 51,440 33,840
Earnings (loss) before income taxes (39,531) 135,018
Income tax expense (recovery) 13,666 61,077
Net earnings (loss) (53,197) 73,941
Net earnings (loss) attributable to:    
Equity holders (53,169) 74,000
Non-controlling interest (28) (59)
Profit (loss) $ (53,197) $ 73,941
Earnings per common share attributable to equity holders:    
Basic $ (0.13) $ 0.19
Diluted $ (0.13) $ 0.19