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Equity - Distribution of borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]      
Non-current gross financial debt $ 560,738 $ 458,056 $ 269,325
Current gross financial debt 84,651 113,281 245,262
Gross financial debt $ 645,389 $ 571,337 $ 514,587
Non-current gross financial debt to total gross financial debt (as a percentage) 86.88% 80.17% 52.34%
Current gross financial debt to total gross financial debt (as a percentage) 13.12% 19.83% 47.66%
Gross financial debt (as a percentage) 100.00% 100.00% 100.00%
Gross financial debt, including discontinued operations     $ 601,546
Spanish energy business classified as held for sale      
Disclosure of classes of share capital [line items]      
Non-current gross financial debt     76,452
Current gross financial debt     10,507
Gross financial debt     $ 86,959