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CAPITAL AND RESERVES - Hedging Reserve Rollforward (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of reserves within equity [line items]  
Equity at beginning of period $ 337,916
Equity at end of period 438,714
Reserve of cash flow hedges  
Disclosure of reserves within equity [line items]  
Equity at beginning of period 0
Gain/(loss) arising on changes in fair value of hedging instruments during the period 298
(Gain)/loss reclassified to profit or loss – hedged item has affected profit or loss 54
Equity at end of period $ 352