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OTHER INCOME (EXPENSES) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
OTHER INCOME (EXPENSE) |  |  |  |
Unrealized and realized gain (loss) on investments (note 4) | $ 3,220 | $ (24) | $ 4,972 | $ (3,293)
Foreign currency (loss) gain | 1,616 | 1,159 | 1,242 | 3,568
Other income | 71 |  | 203 | 617
Loss on sale of assets | (134) |  | (134) | (99)
Total other income (expense) | $ 4,773 | $ 1,135 | $ 6,283 | $ 793

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