Other long-term liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Subclassifications of assets, liabilities and equities [abstract]

Composition of other 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

Provision for site restoration costs

The movement in the provision during the year is explained as follows:

	2021		2020
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