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Other assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract] |
Schedule of other assets |
As at | Dec 31 2017 |  | Dec 31 2016 |
Restricted cash | $ | 27,863 |  | $ | 35,386 |
Chile VAT receivable | 25,456 |  | 23,406 |
Investment in Carbon Recycling International | 4,502 |  | 4,502 |
Defined benefit pension plans (note 20) | 6,650 |  | 5,862 |
Other | 13,555 |  | 9,628 |
| $ | 78,026 |  | $ | 78,784 |

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