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Equity - Net financial debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of classes of share capital [line items]        
Consolidated equity $ 884,372 $ 937,758 $ 892,042 $ 1,294,973
Gross financial debt 645,389 571,337 514,587  
Cash and cash equivalents (216,647) (184,472) (196,931)  
Net financial debt $ 428,742 $ 386,865 317,656  
Net financial debt, including discontinued operations     $ 404,564  
Net financial debt/Consolidated equity 48.48% 41.25% 35.61%  
Net financial debt/Consolidated equity, including discontinued operations     45.4  
Spanish energy business classified as held for sale        
Disclosure of classes of share capital [line items]        
Gross financial debt     $ 86,959  
Cash and cash equivalents   $ (51)