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TRADE AND OTHER RECEIVABLES (Schedule of Trade and Other Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Trade and other current receivables [abstract]    
Trade receivables, net of impairment losses $ 21,318 $ 17,242
Prepayments 807 891
Contract assets 1,894 2,107
Value added tax 63
Finance lease receivables 359 500
Total and other receivables $ 24,441 $ 20,740