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Income Taxes - Continuity of Net Deferred Income Tax Liability (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | $ 235,308 | $ 310,836 |  |
Recognized in Net Income | (160,967) | (68,555) |  |
Foreign Currency Translation Adjustment | (12,192) | 6,973 |  |
Ending balance | 86,533 | 235,308 |  |
Non-capital loss carry-forwards |  |  | $ 2,165,200 | $ 1,714,600
Recognized in Net Income | (160,967) | (68,555) |  |
Deferred tax asset | 86,533 | 310,836 | 86,533 | 235,308
Petroleum and natural gas properties |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | 881,994 | 954,506 |  |
Recognized in Net Income | (378,321) | (48,995) |  |
Foreign Currency Translation Adjustment | 1,048 | 23,517 |  |
Ending balance | 502,625 | 881,994 |  |
Recognized in Net Income | (378,321) | (48,995) |  |
Deferred tax asset | 502,625 | 954,506 | 502,625 | 881,994
Financial derivatives |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | 0 | 21,486 |  |
Recognized in Net Income | 0 | (21,486) |  |
Ending balance | 0 | 0 |  |
Recognized in Net Income | 0 | (21,486) |  |
Deferred tax asset | 0 | 0 | 0 | 0
Other |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | 2,403 | 3,045 |  |
Recognized in Net Income | 18,839 | (5,192) |  |
Foreign Currency Translation Adjustment | (1,135) | (4,550) |  |
Ending balance | 22,377 | 2,403 |  |
Recognized in Net Income | 18,839 | (5,192) |  |
Deferred tax asset | 2,403 | 2,403 | 22,377 | 2,403
Asset retirement obligations |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | (164,523) | (172,359) |  |
Recognized in Net Income | (23,432) | 7,364 |  |
Foreign Currency Translation Adjustment | (115) | (472) |  |
Ending balance | (187,840) | (164,523) |  |
Recognized in Net Income | (23,432) | 7,364 |  |
Deferred tax asset | (164,523) | (164,523) | (187,840) | (164,523)
Financial derivatives |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | (802) | 0 |  |
Recognized in Net Income | (4,608) | (802) |  |
Ending balance | (5,410) | (802) |  |
Recognized in Net Income | (4,608) | (802) |  |
Deferred tax asset | (802) | (802) | (5,410) | (802)
Non-capital losses |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | (386,717) | (399,699) |  |
Recognized in Net Income | 141,468 | 1,460 |  |
Foreign Currency Translation Adjustment | (3,735) | (11,522) |  |
Ending balance | (241,514) | (386,717) |  |
Recognized in Net Income | 141,468 | 1,460 |  |
Deferred tax asset | (386,717) | (386,717) | (241,514) | (386,717)
Other |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | (97,047) |  |  |
Recognized in Net Income | 85,087 |  |  |
Foreign Currency Translation Adjustment | (8,255) |  |  |
Ending balance | (3,705) | (97,047) |  |
Recognized in Net Income | 85,087 |  |  |
Deferred tax asset | (3,705) | (97,047) | $ (3,705) | (97,047)
Finance costs |  |  |  |
Changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | (97,047) | (96,143) |  |
Recognized in Net Income |  | (904) |  |
Ending balance |  | (97,047) |  |
Recognized in Net Income |  | (904) |  |
Deferred tax asset | $ (97,047) | $ (97,047) |  | $ (97,047)

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