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Investment in associate company - Company's Share of Profit of Associate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]      
Share of profit from associated companies $ 802 $ 649 $ 467
Other comprehensive income for the year, net of tax 193 28  
Total comprehensive income for the year $ 995 $ 677