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Exploration and Evaluation Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Exploration For And Evaluation Of Mineral Resources [Abstract] |
Exploration and evaluation assets |
| December 31, 2020 | December 31, 2019
Balance, beginning of year | $ | 320,210 |  | $ | 358,935 |
Capital expenditures | 4,490 |  | 2,948 |
Property acquisitions | — |  | 1,523 |
Divestitures | — |  | (443) |
Impairment | (113,058) |  | (7,822) |
Property swaps | 468 |  | 417 |
Exploration and evaluation expense | (14,011) |  | (11,764) |
Transfers to oil and gas properties (note 6) | (8,585) |  | (16,204) |
Foreign currency translation | 2,351 |  | (7,380) |
Balance, end of year | $ | 191,865 |  | $ | 320,210 |
Impairment of cash generating units | The following table indicates the impairment booked for each CGU at March 31, 2020.
| Impairment at March 31, 2020
Conventional CGU | $ | 4,000 |
Peace River CGU | 20,000 |
Lloydminster CGU | 42,000 |
Viking CGU | 13,000 |
Eagle Ford CGU | 48,861 |
| $ | 127,861 |
Schedule of impairment and impairment reversal | The following table indicates the impairment reversal booked for the Viking and Eagle Ford CGUs at December 31, 2020.
| Impairment reversal at December 31, 2020
Viking CGU | $ | 2,000 |
Eagle Ford CGU | 12,803 |
| $ | 14,803 |

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- Definition The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of impairment loss and the reversal of impairment loss. [Refer: Impairment loss; Reversal of impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_126&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of an impairment loss recognised or reversed for a cash-generating unit. [Refer: Impairment loss; Reversal of impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2020-01-01 + Details
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