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Other intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year $ 58,658 $ 62,839  
Additions 1,992 5,904  
Disposals (7,324) (13,739)  
Business combinations (Note 5) 45    
Exchange differences (1,549) 3,654  
Other intangible assets at end of the year 51,822 58,658 $ 62,839
Impairment of intangible assets 16,073 443 230
Intangible assets pledged as security 26,948    
Accumulated depreciation and amortisation      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year (72,751) (54,629)  
Additions (9,312) (8,440)  
Disposals   565  
Transfers from/(to) other accounts   3,894  
Exchange differences 2,546 (6,353)  
Other intangible assets at end of the year (79,517) (72,751) (54,629)
Accumulated impairment      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year (10,258) (8,666)  
Additions (16,073) (443)  
Exchange differences 718 (1,149)  
Other intangible assets at end of the year (25,613) (10,258) (8,666)
Other segments      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 10,048    
Other intangible assets at end of the year 1,256 10,048  
Other segments | Spain      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Impairment of intangible assets 13,947    
Capitalised development expenditure | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 50,482 40,354  
Additions 992 260  
Transfers from/(to) other accounts 1,919 (4,044)  
Exchange differences (2,408) 5,824  
Other intangible assets at end of the year 50,985 50,482 40,354
Power Supply Agreements | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 37,836 37,836  
Other intangible assets at end of the year 37,836 37,836 37,836
Rights of use | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 23,039 20,345  
Additions   55  
Exchange differences (648) 2,639  
Other intangible assets at end of the year 22,391 23,039 20,345
Computer software | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 6,047 5,815  
Disposals (64) (10)  
Business combinations (Note 5) 45    
Exchange differences (101) 242  
Other intangible assets at end of the year 5,927 6,047 5,815
Other intangible assets | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Other intangible assets at beginning of the year 24,263 21,784  
Additions 26,385 14,472  
Disposals (7,260) (14,294)  
Transfers from/(to) other accounts (1,919) 150  
Exchange differences (1,656) 2,451  
Other intangible assets at end of the year $ 39,813 $ 24,263 $ 21,784