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Tax matters - Components of current and deferred tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax matters      
Current income tax charge/(credit) $ 22,795 $ 30,491 $ (14,885)
Adjustments in current income tax in respect of prior period years (865) 753 1,220
Total 21,930 31,244 (13,665)
Origination and reversal of temporary differences 2,500 (14,857) (33,030)
Impact of tax rate changes 98 (31,688)  
Adjustments in deferred tax in respect of prior years (293) 480  
Total 2,305 (46,065) (33,030)
Income tax expense (benefit) $ 24,235 $ (14,821) [1] $ (46,695) [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.