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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Subclassifications of assets, liabilities and equities [abstract] |
Composition of other liabilities |
As at | Dec 31 2022 | Dec 31 2021
Share-based compensation liability (note 14) | $ | 70,569 |  | $ | 68,634 |
Site restoration costs | 36,581 |  | 29,355 |
Land mortgage | 28,514 |  | 28,985 |
Defined benefit pension plans (note 21) | 19,216 |  | 20,616 |
Cash flow hedges (note 19) | 6,739 |  | 60,098 |
Other | 2,532 |  | 3,252 |
| 164,151 |  | 210,940 |
Less current maturities | (29,548) |  | (17,191) |
| $ | 134,603 |  | $ | 193,749 |
Provision for site restoration costs | The movement in the provision during the year is explained as follows:
| 2022 | 2021
Balance at January 1 | $ | 29,355 |  | $ | 31,941 |
New or revised provisions | 6,915 |  | (2,767) |
Accretion expense | 311 |  | 181 |
Balance at December 31 | $ | 36,581 |  | $ | 29,355 |

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