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Income and expenses - Staff Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Staff costs      
Wages, salaries and similar expenses $ 265,405 $ 222,733 $ 212,098
Pension plan contributions 12,136 13,631 10,647
Employee benefit costs 63,523 65,599 73,654
Staff costs $ 341,064 $ 301,963 [1] $ 296,399 [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.