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Consolidated statements of earnings - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Consolidated statements of earnings [Abstract]    
Revenue from products and services $ 2,156,852 $ 2,431,404
Cost of products and services sold 1,390,233 1,596,235
Depreciation and amortization 330,345 371,689
Cost of sales 1,720,578 1,967,924
Gross profit 436,274 463,480
Administration 163,095 206,652
Impairment charges 358,330 361,989
Exploration 29,933 42,579
Research and development 5,660 4,952
Other operating expense (income) 43 (34,075)
Loss on disposal of assets 6,947 23,168
Loss from operations (127,734) (141,785)
Finance costs (110,608) (111,906)
Gain on derivatives 56,250 34,407
Finance income 5,265 4,379
Other income (expense) (30,410) 60,671
Loss before income taxes (207,237) (154,234)
Income tax recovery (2,519) (94,355)
Net loss (204,718) (59,879)
Net earnings (loss) attributable to:    
Equity holders (204,942) (61,611)
Non-controlling interest 224 1,732
Net loss $ (204,718) $ (59,879)
Loss per common share attributable to equity holders:    
Basic $ (0.52) $ (0.16)
Diluted $ (0.52) $ (0.16)