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Interest expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Interest Expense [Abstract] |
Schedule of interest expense |
Year ended December 31, |  | 2017 |  |  | 2016 |
Interest on capital lease obligations |  | $ | 3,023 |  |  | $ | 2,836 |
Interest on credit facilities |  | 1,507 |  |  | 1,593 |
Interest on Series 1 Debentures |  | — |  |  | 977 |
Interest on Convertible Debentures |  | 1,760 |  |  | — |
Amortization of deferred financing costs (note 10(c) and note 13(e)) |  | 797 |  |  | 572 |
Interest on long term debt |  | $ | 7,087 |  |  | $ | 5,978 |
Other interest income |  | (144 | ) |  | (194 | )
|  | $ | 6,943 |  |  | $ | 5,784 |

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