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STAFF COSTS (Details 4) - Long term incentive plan - Share
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 1 January 1,999,800 0 0
Granted during the period 866,600 2,127,400 0
Exercised during the period 0 0 0
Expired during the period (233,900) 0 0
Forfeited during the period (21,300) (127,600) 0
Outstanding 31 December 2,611,200 1,999,800 0
Exercisable 31 December 255,300 538,900 0