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FINANCIAL INSTRUMENTS - Interest rate risk (Details) - Variable rate - Interest rate risk - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments    
Sensitivity analysis, assumed increase in interest rate (as a percent) 5.00% 5.00%
Increase in profit if variable interest rates had been higher by 5% $ 293 $ 268
Sensitivity analysis, assumed decrease in interest rate (as a percent) 5.00% 5.00%
Decrease in profit if variable interest rates had been higher by 5% $ (300) $ (268)