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FINANCE INCOME AND EXPENSES - Interest earned and other finance income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Interest earned $ 9,219 $ 4,132
Accretion income on deferred consideration 2,542 1,998
Total interest earned and other finance income $ 11,761 $ 6,130