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Finance costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Finance Costs [Abstract] |
Schedule of finance costs |
|  | 2018 |  |  | 2017
Interest on long-term debt | $ | 73,039 |  | $ | 73,211
Unwinding of discount on provisions [note 15] |  | 23,681 |  |  | 22,020
Other charges |  | 15,059 |  |  | 15,377
Total | $ | 111,779 |  | $ | 110,608

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