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Asset Retirement Obligations - Changes In Asset Retirement Obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in other provisions [Abstract] |  |
Accretion | $ 12,381 | $ 8,978
Government grants | (2,857) | (2,128)
Less current portion of asset retirement obligations | 11,080 | 11,820
Non-current portion of asset retirement obligations | 732,603 | 748,563
Asset retirement obligation |  |
Reconciliation of changes in other provisions [Abstract] |  |
Balance, beginning of the year | 760,383 | 667,974
Liabilities incurred | 14,845 | 15,189
Liabilities settled | (6,662) | (7,168)
Liabilities acquired from property acquisitions | 249 | 0
Liabilities divested | (3,161) | (721)
Property swaps | (4,113) | (525)
Accretion | 12,381 | 8,978
Government grants | (2,857) | (2,128)
Change in estimate | (9,686) | (12,771)
Changes in discount rates and inflation rates | (17,381) | 92,576
Foreign currency translation | (315) | (1,021)
Balance, end of the year | $ 743,683 | $ 760,383

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