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Other long-term liabilities
 12 Months Ended
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term liabilities Other long-term 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 
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, 2021, the total undiscounted amount of estimated cash flows required to settle the liabilities was $33.9 million (2020 - $35.5 million). The movement in the provision during the year is explained as follows:
20212020
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