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Note 19 - Borrowings - Non-current and Current Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Non-current costs of issue of debt $ (40) $ (37)
34,645 31,542
Current costs of issue of debt (12) (8)
931,214 808,694
Total Borrowings 965,859 840,236
Bank borrowings [member]    
Statement Line Items [Line Items]    
Non-current borrowings before costs of issue of debt 34,626 31,544
Current borrowings before costs of issue of debt 930,957 807,252
Finance lease liabilities [member]    
Statement Line Items [Line Items]    
Non-current borrowings before costs of issue of debt 59 35
Current borrowings before costs of issue of debt 138 130
Total Borrowings 197 165
Bank overdrafts [member]    
Statement Line Items [Line Items]    
Current borrowings before costs of issue of debt $ 131 $ 1,320