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Consolidated statements of earnings - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Consolidated statements of earnings [Abstract]    
Revenue from products and services $ 1,862,925 $ 2,091,661
Cost of products and services sold 1,345,551 1,467,940
Depreciation and amortization 275,749 327,973
Cost of sales 1,621,300 1,795,913
Gross profit 241,625 295,748
Administration 124,869 141,552
Exploration 13,686 20,283
Research and development 6,058 1,757
Other operating expense 2,732 59,616
Loss on disposal of assets 1,869 2,303
Earnings from operations 92,411 70,237
Finance costs (98,622) (111,779)
Gain (loss) on derivatives 32,269 (81,081)
Finance income 29,760 22,071
Share of earnings from equity-accounted investee 45,360 32,321
Other income (expense) 33,840 108,160
Earnings before income taxes 135,018 39,929
Income tax expense (recovery) 61,077 (126,306)
Net earnings 73,941 166,235
Net earnings (loss) attributable to:    
Equity holders 74,000 166,323
Non-controlling interest (59) (88)
Net earnings $ 73,941 $ 166,235
Earnings per common share attributable to equity holders:    
Basic $ 0.19 $ 0.42
Diluted $ 0.19 $ 0.42