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Supplementary cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Statement of Cash Flow [Abstract] |
Summary of Change in Cash Flow Information |
Changes in non-cash working capital: | December 31, 2020 |  | December 31, 2019
Accounts receivable and other | $ | (5,408) |  |  | $ | 6,685 |
Inventories | (3,209) |  |  | (16,410) |
Accounts payable and accrued liabilities | 43,386 |  |  | 25,637 |
| $ | 34,769 |  |  | $ | 15,912 |

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