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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract] |
Composition of other 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 |
Provision for site restoration costs | 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 |
Finance lease obligations payable | 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 |
The Company has future minimum lease payments under operating leases relating primarily to vessel charter, terminal facilities, office space, equipment and other operating lease commitments as follows: As at December 31, 2017
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |
$ | 90,820 |  | $ | 90,035 |  | $ | 56,973 |  | $ | 38,982 |  | $ | 37,858 |  | $ | 163,822 |

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