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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Equity | $ 651,670 | $ 527,305 | $ 402,651
Cash and cash equivalents | 12,539 | 21,434 | $ 5,346
Assets | $ 660,915 | 534,882 |
Currency risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Monetary assets and liabilities currency risk percentage change | 10.00% |  |
Monetary assets and liabilities currency risk changes increase (decrease) in net income | $ 500 |  |
Monetary assets and liabilities currency risk changes increase (decrease) in other comprehensive income | $ 2,900 |  |
Other price risk [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Long term investments percentage change threshold | 10.00% |  |
Long term investments fair value increase (decrease) potential in profit (loss) | $ 1,200 |  |
Long term investments fair value increase (decrease) potential in other comprehensive income (loss) | 2,400 |  |
Recurring fair value measurement [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Assets | $ 78,882 | $ 61,293 |

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