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FINANCIAL INSTRUMENTS - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets            
Financial assets at fair value through profits or losses $ 14,113   $ 16,587      
Liabilities            
Derivative financial instruments 2,065   448      
Level 1            
Assets            
Financial assets at fair value through profits or losses 14,113   16,587      
Level 3            
Liabilities            
Derivative financial instruments $ 2,065 $ 398 $ 448 $ 2,622 $ 4,873 $ 6,155