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OTHER INCOME (EXPENSES) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
OTHER INCOME (EXPENSE) |  |  |  |
Unrealized and realized gain (loss) on investments (note 4) | $ 925 | $ (534) | $ 1,752 | $ (3,269)
Foreign currency (loss) gain | (537) | 1,482 | (374) | 2,409
Other income | 75 | 373 | 132 | 617
Loss on sale of assets |  | (99) |  | (99)
Total other income (expense) | $ 463 | $ 1,222 | $ 1,510 | $ (342)

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