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Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 25, 2012
installment
Lease liabilities [abstract]      
Non-current $ 53,472 $ 69,713  
Current 12,999 12,920  
Total 66,471 82,633  
Finance Leases [Abstract]      
Minimum finance lease payments payable 74,918 95,964  
Future finance charge on finance lease 8,447 13,331  
Minimum finance lease payments payable, at present value 66,471 82,633  
Operating Leases [Abstract]      
Minimum Operating Lease Payments 31,263 42,729  
Hydroelectrical installations (including power lines and concessions)      
Lease liabilities [abstract]      
Non-current 52,428 68,088  
Current 12,577 12,551  
Total 65,005 80,639  
Number of loan installments | installment     120
Hydroelectrical installations (including power lines and concessions) | EURIBOR      
Lease liabilities [abstract]      
Applicable margin (as a percent)     3.50%
Other finance leases      
Lease liabilities [abstract]      
Non-current 1,044 1,625  
Current 422 369  
Total 1,466 1,994  
Not later than one year      
Finance Leases [Abstract]      
Minimum finance lease payments payable 13,362 13,281  
Minimum finance lease payments payable, at present value 12,999 12,920  
Operating Leases [Abstract]      
Minimum Operating Lease Payments 9,684 12,105  
Later than one year and not later than two years      
Lease liabilities [abstract]      
Non-current 13,817    
Later than one year and not later than two years | Hydroelectrical installations (including power lines and concessions)      
Lease liabilities [abstract]      
Non-current 13,199    
Later than one year and not later than two years | Other finance leases      
Lease liabilities [abstract]      
Non-current 618    
Between one and five years      
Finance Leases [Abstract]      
Minimum finance lease payments payable 61,556 82,683  
Minimum finance lease payments payable, at present value 53,472 69,713  
Operating Leases [Abstract]      
Minimum Operating Lease Payments 20,847 27,277  
Later than two years and not later than three years      
Lease liabilities [abstract]      
Non-current 14,275    
Later than two years and not later than three years | Hydroelectrical installations (including power lines and concessions)      
Lease liabilities [abstract]      
Non-current 13,849    
Later than two years and not later than three years | Other finance leases      
Lease liabilities [abstract]      
Non-current 426    
Later than three years and not later than four years      
Lease liabilities [abstract]      
Non-current 25,380    
Later than three years and not later than four years | Hydroelectrical installations (including power lines and concessions)      
Lease liabilities [abstract]      
Non-current 25,380    
Later than five years [member]      
Operating Leases [Abstract]      
Minimum Operating Lease Payments $ 732 $ 3,347