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FINANCIAL INSTRUMENTS (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |  |
Short-term investments | $ 18,252 |  |
Long-term investments | 60,630 | $ 61,293 | $ 26,580
Total assets | 660,915 | 534,882 |
Recurring fair value measurement [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Total assets | 78,882 | 61,293 |
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Total assets | 43,974 | 28,850 |
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Total assets | 34,908 | 32,443 |
Recurring fair value measurement [member] | Covertible Debt [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Short-term investments | 15,000 |  |
Long-term investments | 16,595 | 29,039 |
Recurring fair value measurement [member] | Covertible Debt [member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Short-term investments | 15,000 |  |
Long-term investments | 16,595 | 29,039 |
Recurring fair value measurement [member] | Warrants [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term investments | 3,313 | 3,404 |
Recurring fair value measurement [member] | Warrants [member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term investments | 3,313 | 3,404 |
Recurring fair value measurement [member] | Common Shares Held [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Short-term investments | 3,252 |  |
Long-term investments | 40,722 | 28,850 |
Recurring fair value measurement [member] | Common Shares Held [member] | Level 1 of fair value hierarchy [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Short-term investments | 3,252 |  |
Long-term investments | $ 40,722 | $ 28,850 |

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