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BORROWINGS (Schedule of Exchangeable Notes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-current assets    
Exchangeable note bond call option $ 360
Non-current liabilities    
Exchangeable note equity conversion option 440 3,970
Exchangeable note bond put option 1,790 290
Total non-current liabilities 2,230 4,260
Total value of embedded derivatives - net liability $ 1,870 $ 4,260