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Capital Management (Tables) | 12 Months Ended
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Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract] |
Capital management information | It is reconciled to the nearest measure determined in accordance with IFRS, cash flow from operating activities, as set forth below.
| Years Ended December 31
| 2020 | 2019
Cash flow from operating activities | $ | 353,096 |  | $ | 834,939 |
Change in non-cash working capital | (48,758) |  | 52,070 |
Asset retirement obligations settled | 7,168 |  | 15,417 |
Adjusted funds flow | $ | 311,506 |  | $ | 902,426 |
The computation of net debt is set forth below.
| December 31, 2020 | December 31, 2019
Credit facilities - principal | $ | 651,173 |  | $ | 506,471 |
Long-term notes - principal | 1,147,950 |  | 1,337,200 |
Trade and other payables | 155,955 |  | 207,454 |
Cash | — |  | (5,572) |
Trade and other receivables | (107,477) |  | (173,762) |
Net debt | $ | 1,847,601 |  | $ | 1,871,791 |

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