Other long-term liabilities

12 Months Ended

Dec. 31, 2019

Subclassifications of assets, liabilities and equities [abstract]

Other long-term liabilities:



As at	Dec 31 2019			Dec 31 2018
Site restoration costs	$	31,092		$	27,638
Share-based compensation liability (note 14)	18,382			52,794
Cash flow hedges (note 19)	195,124			105,721
Defined benefit pension plans (note 21)	28,121			24,783
Land mortgage	29,849			30,242
Government grant construction obligation	3,173			—
Other	6,582			3,306
	312,323			244,484
Less current maturities	(26,252		)	(36,914		)
	$	286,071		$	207,570

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, 2019, the total undiscounted amount of estimated cash flows required to settle the liabilities was $38.1 million (2018 - $37.6 million). The movement in the provision during the year is explained as follows:



	2019		2018
Balance at January 1	$	27,638	$	33,975
New or revised provisions	2,638		(7,036		)
Accretion expense	816		699
Balance at December 31	$	31,092	$	27,638