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FINANCE INCOME AND EXPENSES - Interest earned and other finance income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]    
Interest earned $ 4,132 $ 1,670
Accretion income on deferred consideration 1,998 96
Total interest earned and other finance income $ 6,130 $ 1,766