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Consolidated Statements of Cash Flows - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities    
Net loss - basic $ (2,438,964) $ (12,459)
Adjustments for:    
Share-based compensation 7,216 15,894
Unrealized foreign exchange loss (gain) 9,232 (62,753)
Exploration and evaluation 14,011 11,764
Depletion and depreciation 486,380 731,686
Impairments 2,360,220 187,822
Non-cash financing, accretion and early redemption expense 18,907 18,448
Non-cash other income (2,128) 0
Unrealized financial derivatives loss 18,500 82,817
Gain on dispositions (901) (2,238)
Deferred income tax recovery (160,967) (68,555)
Asset retirement obligations settled 7,168 15,417
Change in non-cash working capital 48,758 (52,070)
Cash provided by (used in) operating activities 353,096 834,939
Financing activities    
Increase (decrease) in credit facilities 143,248 (7,775)
Payments on lease obligations (5,925) (5,956)
Net proceeds from issuance of long-term notes 652,150 0
Redemption of long-term notes (833,672) (198,128)
Cash provided by financing activities (44,199) (211,859)
Investing activities    
Additions to exploration and evaluation assets (4,490) (2,948)
Additions to oil and gas properties (275,850) (549,343)
Additions to other plant and equipment (2,280) (552)
Property acquisitions 0 (3,667)
Proceeds from dispositions 182 1,487
Change in non-cash working capital (32,031) (62,485)
Cash used in investing activities (314,469) (617,508)
Change in cash (5,572) 5,572
Cash, beginning of year 5,572 0
Cash, end of year 0 5,572
Supplementary information    
Interest paid 102,358 112,241
Income taxes paid $ 1,155 $ 1,160