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Other long-term liabilities
 12 Months Ended
Dec. 31, 2022
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term liabilities Other long-term 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 
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, 2022, the total undiscounted amount of estimated cash flows required to settle the liabilities was $52.1 million (2021 - $33.9 million). The movement in the provision during the year is explained as follows:
20222021
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