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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract] |
Composition of other liabilities |
As at | Dec 31 2020 | Dec 31 2019
Cash flow hedges (note 19) | $ | 180,798 |  | $ | 195,124 |
Share-based compensation liability (note 14) | 71,913 |  | 18,382 |
Defined benefit pension plans (note 21) | 36,646 |  | 28,121 |
Site restoration costs | 31,941 |  | 31,092 |
Land mortgage | 29,430 |  | 29,849 |
Government grant construction obligation | — |  | 3,173 |
Other | 3,915 |  | 6,582 |
| 354,643 |  | 312,323 |
Less current maturities | (27,152) |  | (26,252) |
| $ | 327,491 |  | $ | 286,071 |
Provision for site restoration costs | The movement in the provision during the year is explained as follows:
| 2020 | 2019
Balance at January 1 | $ | 31,092 |  | $ | 27,638 |
New or revised provisions | 423 |  | 2,638 |
Accretion expense | 426 |  | 816 |
Balance at December 31 | $ | 31,941 |  | $ | 31,092 |

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