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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018
2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
$ | 456,804 |  | $ | 369,401 |  | $ | 371,345 |  | $ | 340,595 |  | $ | 319,509 |  | $ | 1,502,356 |
Schedule of minimum lease payments | Finance lease obligations are payable as follows:
| Lease payments |  | Interest component |  | Finance lease obligations |
2019 | $ | 32,222 |  | $ | 22,990 |  | $ | 9,232 |
2020 | 32,614 |  | 22,001 |  | 10,613 |
2021 | 33,014 |  | 20,837 |  | 12,177 |
2022 | 33,422 |  | 19,473 |  | 13,949 |
2023 | 32,779 |  | 17,915 |  | 14,864 |
Thereafter | 206,223 |  | 68,684 |  | 137,539 |
| $ | 370,274 |  | $ | 171,900 |  | $ | 198,374 |
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, 2018
2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
$ | 79,692 |  | $ | 70,896 |  | $ | 49,325 |  | $ | 47,749 |  | $ | 55,147 |  | $ | 124,480 |

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- Definition Contingent Liabilities With Associates [Table Text Block] + References No definition available. + Details
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