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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of earnings per share [Abstract] |
Disclosure of detailed information about reconciliation of income and shares in earnings per share [Text Block] | The following table presents a reconciliation of the income and share data used in the basic and diluted earnings per share (“EPS”) computations for the dates indicated:
|  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
(Thousands of U.S. dollars) |  |  |  |  |  |  |  |  |  |
Profit for the year |  |  | 81,999 |  |  | 87,045 |  |  | 103,984 |
(U.S. dollars) |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  | 2.09 |  |  | 2.23 |  |  | 2.67 |
Diluted earnings per share |  |  | 2.08 |  |  | 2.22 |  |  | 2.66 |
(Share units) |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - applicable to basic |  |  | 39,311 |  |  | 39,085 |  |  | 38,925 |
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units plans |  |  | 18 |  |  | 125 |  |  | 188 |
Adjusted weighted average common shares outstanding applicable to diluted EPS |  |  | 39,329 |  |  | 39,210 |  |  | 39,113 |

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