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Segmented Financial Information - Information By Reportable Segment (Details) - CAD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Revenue [abstract] |  |  |
Petroleum and natural gas sales |  | $ 975,477 | $ 1,805,919
Royalties |  | (163,735) | (320,241)
Revenue, net of royalties |  | 811,742 | 1,485,678
Expenses |  |  |
Operating |  | 331,345 | 397,716
Transportation |  | 28,437 | 43,942
Blending and other |  | 48,381 | 68,795
General and administrative |  | 34,268 | 45,469
Exploration and evaluation |  | 14,011 | 11,764
Depletion and depreciation |  | 486,380 | 731,686
Impairment | $ 2,588,488 | 2,360,220 | 187,822
Share-based compensation |  | 7,216 | 15,894
Financing and interest |  | 125,441 | 125,865
Financial derivatives (gain) loss |  | (29,336) | 7,197
Foreign exchange loss (gain) |  | (8,688) | 61,787
Gain on dispositions |  | (901) | (2,238)
Other income |  | 5,304 | 7,526
Total expenses |  | 3,411,099 | 1,564,599
Net loss before income taxes |  | (2,599,357) | (78,921)
Income tax (recovery) expense |  |  |
Current income tax expense |  | 574 | 2,093
Deferred income tax (recovery) expense |  | (160,967) | (68,555)
Income tax recovery |  | (160,393) | (66,462)
Net loss |  | (2,438,964) | (12,459)
Operating segments | Canada |  |  |
Revenue [abstract] |  |  |
Petroleum and natural gas sales |  | 571,741 | 1,077,724
Royalties |  | (46,064) | (107,467)
Revenue, net of royalties |  | 525,677 | 970,257
Expenses |  |  |
Operating |  | 247,050 | 298,303
Transportation |  | 28,437 | 43,942
Blending and other |  | 48,381 | 68,795
General and administrative |  | 0 | 0
Exploration and evaluation |  | 14,011 | 11,764
Depletion and depreciation |  | 309,420 | 463,501
Impairment |  | 1,737,000 | 187,822
Share-based compensation |  | 0 | 0
Financing and interest |  | 0 | 0
Financial derivatives (gain) loss |  | 0 | 0
Foreign exchange loss (gain) |  | 0 | 0
Gain on dispositions |  | (901) | (2,238)
Other income |  | 2,128 | 0
Total expenses |  | 2,381,270 | 1,071,889
Net loss before income taxes |  | (1,855,593) | (101,632)
Income tax (recovery) expense |  |  |
Current income tax expense |  | 469 | 101
Deferred income tax (recovery) expense |  | (77,201) | (32,942)
Income tax recovery |  | (76,732) | (32,841)
Net loss |  | (1,778,861) | (68,791)
Total oil and natural gas capital expenditures |  | 174,770 | 376,543
Operating segments | U.S. |  |  |
Revenue [abstract] |  |  |
Petroleum and natural gas sales |  | 403,736 | 728,195
Royalties |  | (117,671) | (212,774)
Revenue, net of royalties |  | 286,065 | 515,421
Expenses |  |  |
Operating |  | 84,295 | 99,413
Transportation |  | 0 | 0
Blending and other |  | 0 | 0
General and administrative |  | 0 | 0
Exploration and evaluation |  | 0 | 0
Depletion and depreciation |  | 169,439 | 261,766
Impairment |  | 623,220 | 0
Share-based compensation |  | 0 | 0
Financing and interest |  | 0 | 0
Financial derivatives (gain) loss |  | 0 | 0
Foreign exchange loss (gain) |  | 0 | 0
Gain on dispositions |  | 0 | 0
Other income |  | 0 | 0
Total expenses |  | 876,954 | 361,179
Net loss before income taxes |  | (590,889) | 154,242
Income tax (recovery) expense |  |  |
Current income tax expense |  | 105 | 1,992
Deferred income tax (recovery) expense |  | (57,199) | 10,055
Income tax recovery |  | (57,094) | 12,047
Net loss |  | (533,795) | 142,195
Total oil and natural gas capital expenditures |  | 105,388 | 177,928
Operating segments | Corporate |  |  |
Revenue [abstract] |  |  |
Petroleum and natural gas sales |  | 0 | 0
Royalties |  | 0 | 0
Revenue, net of royalties |  | 0 | 0
Expenses |  |  |
Operating |  | 0 | 0
Transportation |  | 0 | 0
Blending and other |  | 0 | 0
General and administrative |  | 34,268 | 45,469
Exploration and evaluation |  | 0 | 0
Depletion and depreciation |  | 7,521 | 6,419
Impairment |  | 0 | 0
Share-based compensation |  | 9,469 | 15,894
Financing and interest |  | 125,441 | 125,865
Financial derivatives (gain) loss |  | (29,336) | 7,197
Foreign exchange loss (gain) |  | 8,688 | 61,787
Gain on dispositions |  | 0 | 0
Other income |  | (3,176) | 7,526
Total expenses |  | 152,875 | 131,531
Net loss before income taxes |  | (152,875) | (131,531)
Income tax (recovery) expense |  |  |
Current income tax expense |  | 0 | 0
Deferred income tax (recovery) expense |  | (26,567) | (45,668)
Income tax recovery |  | (26,567) | (45,668)
Net loss |  | (126,308) | (85,863)
Total oil and natural gas capital expenditures |  | 0 | 0
Operating segments | Consolidated |  |  |
Revenue [abstract] |  |  |
Petroleum and natural gas sales |  | 975,477 | 1,805,919
Royalties |  | (163,735) | (320,241)
Revenue, net of royalties |  | 811,742 | 1,485,678
Expenses |  |  |
Operating |  | 331,345 | 397,716
Transportation |  | 28,437 | 43,942
Blending and other |  | 48,381 | 68,795
General and administrative |  | 34,268 | 45,469
Exploration and evaluation |  | 14,011 | 11,764
Depletion and depreciation |  | 486,380 | 731,686
Impairment |  | 2,360,220 | 187,822
Share-based compensation |  | 9,469 | 15,894
Financing and interest |  | 125,441 | 125,865
Financial derivatives (gain) loss |  | (29,336) | 7,197
Foreign exchange loss (gain) |  | (8,688) | 61,787
Gain on dispositions |  | (901) | (2,238)
Other income |  | 5,304 | 7,526
Total expenses |  | 3,411,099 | 1,564,599
Net loss before income taxes |  | (2,599,357) | (78,921)
Income tax (recovery) expense |  |  |
Current income tax expense |  | 574 | 2,093
Deferred income tax (recovery) expense |  | (160,967) | (68,555)
Income tax recovery |  | (160,393) | (66,462)
Net loss |  | (2,438,964) | (12,459)
Total oil and natural gas capital expenditures |  | $ 280,158 | $ 554,471

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