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TRADE AND OTHER RECEIVABLES (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of finance lease and operating lease by lessor [line items]        
Trade receivables, net impairment losses provision $ 4,202 $ 3,590 $ 3,171 $ 2,812
Prepayments of impairment 1,608 1,651    
Finance lease receivable 835 1,185    
More than five years [Member]        
Disclosure of finance lease and operating lease by lessor [line items]        
Finance lease receivable $ 476 $ 685