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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Consolidated Statements of Comprehensive Income [abstract] |  |
Net income for the year | $ 33,990 | $ 66,305
Items that will remain permanently in other comprehensive income: |  |
Change in fair value of marketable securities, net of $nil tax | (69) | (307)
Items that may in the future be reclassified to profit or loss: |  |
Change in fair value of hedging instruments, net of $nil tax | (156) | 369
Total other comprehensive income for the year | (225) | 62
Comprehensive income for the year | $ 33,765 | $ 66,367

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