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Other long-term liabilities
 12 Months Ended
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Other Long-Term Liabilities Other long-term liabilities:
As at
Dec 31
2023		Dec 31
2022
Share-based compensation liability (note 14)
$74,107 $70,569 
Site restoration costs
32,596 36,581 
Land mortgage
28,014 28,514 
Defined benefit pension plans (note 21)
22,691 19,216 
Cash flow hedges (note 19)
91,183 6,739 
Other
1,319 2,532 
249,910 164,151 
Less current maturities
(94,992)(29,548)
$154,918 $134,603 
Site restoration costs:
The Company has accrued liabilities related to the decommissioning and reclamation of its methanol production sites and oil and gas properties. Because of uncertainties in estimating the amount and timing of the expenditures related to the sites, actual results could differ from the amounts estimated. As at December 31, 2023, the total undiscounted amount of estimated cash flows required to settle the liabilities was $50.6 million (2022 - $52.1 million). The movement in the provision during the year is explained as follows:
20232022
Balance at January 1
$36,581 $29,355 
New or revised provisions
(5,573)6,915 
Accretion expense
1,588 311 
Balance at December 31
$32,596 $36,581