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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement of comprehensive income [abstract] |  |
Net income for the year | $ 10,537 | $ 25,254
Items that may subsequently be re-classified to net income: |  |
Currency translation differences | (15,205) | 121
Items that will not subsequently be re-classified to net income: |  |
Gain on FVTOCI investments | 8,159 | 16,902
Tax recovery on FVTOCI investments | 335 | 514
Total other comprehensive (loss) income for the year | (6,711) | 17,537
Total comprehensive income for the year | $ 3,826 | $ 42,791

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