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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract] |
Composition of other liabilities |
As at | Dec 31 2021 | Dec 31 2020
Cash flow hedges (note 19) | $ | 60,098 |  | $ | 180,798 |
Share-based compensation liability (note 14) | 68,634 |  | 71,913 |
Defined benefit pension plans (note 21) | 20,616 |  | 36,646 |
Site restoration costs | 29,355 |  | 31,941 |
Land mortgage | 28,985 |  | 29,430 |
Other | 3,252 |  | 3,915 |
| 210,940 |  | 354,643 |
Less current maturities | (17,191) |  | (27,152) |
| $ | 193,749 |  | $ | 327,491 |
Provision for site restoration costs | The movement in the provision during the year is explained as follows:
| 2021 | 2020
Balance at January 1 | $ | 31,941 |  | $ | 31,092 |
New or revised provisions | (2,767) |  | 423 |
Accretion expense | 181 |  | 426 |
Balance at December 31 | $ | 29,355 |  | $ | 31,941 |

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