FINANCIAL INSTRUMENTS - Interest rate risk (Details) - Variable rate - Interest Rate Risk - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Sensitivity to interest rate change
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%	$ 268	$ 22
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%	$ 268	$ 22

- Definition

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- Definition

The decrease in profit and loss as a result of a decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

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- Definition

The increase in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

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- Definition

The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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- Definition

The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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