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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies [Abstract] |
Schedule of minimum estimated commitment under purchase contracts | The minimum estimated commitment under these contracts, except as noted below, is as follows: As at December 31, 2017
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |
$ | 473,927 |  | $ | 371,167 |  | $ | 306,400 |  | $ | 308,338 |  | $ | 245,989 |  | $ | 1,300,609 |
Schedule of minimum lease payments | 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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- Definition The disclosure of finance leases and operating leases by the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition Contingent Liabilities With Associates [Table Text Block] + References No definition available. + Details
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