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Consolidated statements of earnings - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Consolidated statements of earnings [Abstract]    
Revenue from products and services $ 2,091,661 $ 2,156,852
Cost of products and services sold 1,467,940 1,390,233
Depreciation and amortization 327,973 330,345
Cost of sales 1,795,913 1,720,578
Gross profit 295,748 436,274
Administration 141,552 163,095
Impairment charges 0 358,330
Exploration 20,283 29,933
Research and development 1,757 5,660
Other operating expense 59,616 43
Loss on disposal of assets 2,303 6,947
Earnings (loss) from operations 70,237 (127,734)
Finance costs (111,779) (110,608)
Gain (loss) on derivatives (81,081) 56,250
Finance income 22,071 5,265
Share of earnings from equity-accounted investee 32,321 0
Other income (expense) 108,160 (30,410)
Earnings (loss) before income taxes 39,929 (207,237)
Income tax recovery (126,306) (2,519)
Net earnings (loss) 166,235 (204,718)
Net earnings (loss) attributable to:    
Equity holders 166,323 (204,942)
Non-controlling interest (88) 224
Net earnings (loss) $ 166,235 $ (204,718)
Earnings (loss) per common share attributable to equity holders:    
Basic $ 0.42 $ (0.52)
Diluted $ 0.42 $ (0.52)