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Income and expenses - Finance Income and Finance Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finance income      
Finance income of related parties (Note 23) $ 72 $ 224 $ 74
Other finance income 5,302 3,484 1,462
Finance income 5,374 3,708 [1] 1,536 [1]
Finance costs      
Interest on debt instruments 34,188 28,961  
Interest on loans and credit facilities 8,249 15,834 18,630
Interest on note and bill discounting 205 7,403 1,503
Interest on interest rate swaps 1,710 2,689 2,525
Interest on finance leases 2,974 2,917 3,186
Trade receivables securitization expense (Note 10) 12,097 7,256  
Other finance costs 2,599 352 4,407
Finance costs $ 62,022 $ 65,412 [1] $ 30,251 [1]
[1] The amounts for 2016 have been re-presented to show the results of the Spanish energy business within profit (loss) from continuing operations, as described in Note 1 to the consolidated financial statements.