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Income and expenses - Staff Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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