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Property, plant and equipment - Impairment, disposals and pledged as security (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of impairment loss and reversal of impairment loss [abstract]      
Impairment charge related to goodwill   $ 30,618 $ 194,612
Impairment charge related to intangible assets $ 16,073 443 230
Impairment charge related to Property, plant and equipment 42,846 (104) $ 67,624
Property, plant and equipment pledged as security for outstanding bank loans and other payables 514,625 $ 660,960  
Other segments | Spain      
Disclosure of impairment loss and reversal of impairment loss [abstract]      
Impairment charge related to intangible assets 13,947    
Impairment charge related to Property, plant and equipment 40,537    
Other segments | Spain | Land and buildings      
Disclosure of impairment loss and reversal of impairment loss [abstract]      
Impairment charge related to Property, plant and equipment $ 39,101