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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