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Other long-term liabilities | 12 Months Ended
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Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract] |
Other long-term liabilities | Other long-term liabilities:
As at | Dec 31 2017 |  | Dec 31 2016 |
Site restoration costs(a) | $ | 33,975 |  | $ | 30,512 |
Finance lease obligations(b) | 204,242 |  | 201,268 |
Share-based compensation liability (note 13) | 111,405 |  | 53,725 |
Cash flow hedges (note 18) | 90,199 |  | 68,664 |
Defined benefit pension plans (note 20) | 25,076 |  | 22,403 |
Other | 5,214 |  | 4,339 |
| 470,111 |  | 380,911 |
Less current maturities | (65,226 | ) | (29,720 | )
| $ | 404,885 |  | $ | 351,191 |
a) 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, 2017, the total undiscounted amount of estimated cash flows required to settle the liabilities was $44.9 million (2016 - $41.1 million). The movement in the provision during the year is explained as follows:
| 2017 |  | 2016 |
Balance at January 1 | $ | 30,512 |  | $ | 29,892 |
New or revised provisions | 2,823 |  | 51 |
Accretion expense | 640 |  | 569 |
Balance at December 31 | $ | 33,975 |  | $ | 30,512 |
b) Finance lease obligations: As at December 31, 2017, the Company has finance lease obligations related to a methanol terminal and storage tanks in Geismar, Louisiana, an oxygen production facility in Trinidad, and two ocean-going vessels. Total finance lease payments for 2017 of $30.6 million include an interest component of $23.7 million. Finance lease obligations are payable as follows:
| Lease payments |  | Interest component |  | Finance lease obligations |
2018 | $ | 31,447 |  | $ | 23,549 |  | $ | 7,898 |
2019 | 31,826 |  | 22,727 |  | 9,099 |
2020 | 32,213 |  | 21,756 |  | 10,457 |
2021 | 32,608 |  | 20,612 |  | 11,996 |
2022 | 33,010 |  | 19,271 |  | 13,739 |
Thereafter | 236,772 |  | 85,719 |  | 151,053 |
| $ | 397,876 |  | $ | 193,634 |  | $ | 204,242 |

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- Definition The disclosure of other non-current liabilities. [Refer: Other non-current liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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