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Nature of the business, Assets acquired (Details)
$ in Thousands
12 Months Ended
Jul. 20, 2017
USD ($)
MW
Feb. 28, 2017
mi
Jan. 07, 2016
USD ($)
Dec. 31, 2017
Dec. 31, 2016
MW
Aug. 03, 2016
USD ($)
Jul. 30, 2015
Nature of the business [Abstract]              
Percentage interest acquired   12.50%          
Length of transmission lines | mi   114          
Peru [Member]              
Nature of the business [Abstract]              
Gross capacity | MW 4            
Acquisition purchase price $ 9,000            
Honaine [Member]              
Nature of the business [Abstract]              
Ownership interest [1]       25.50%      
Skikda [Member]              
Nature of the business [Abstract]              
Ownership interest [2]       34.20%      
Helioenergy 1/2 [Member]              
Nature of the business [Abstract]              
Ownership interest       100.00%      
Helios 1/2 [Member]              
Nature of the business [Abstract]              
Ownership interest       100.00%      
Solnova 1/3/4 [Member]              
Nature of the business [Abstract]              
Ownership interest       100.00%      
Kaxu [Member]              
Nature of the business [Abstract]              
Percentage interest acquired             51.00%
Ownership interest [3]       51.00%      
Solaben 1/6 [Member]              
Nature of the business [Abstract]              
Ownership interest       100.00%      
Solacor 1/2 [Member]              
Nature of the business [Abstract]              
Percentage interest acquired     13.00%   13.00%    
Acquisition purchase price     $ 19,923        
Ownership interest [4]       87.00%      
Seville PV [Member]              
Nature of the business [Abstract]              
Percentage interest acquired         80.00% 80.00%  
Gross capacity | MW         1    
Acquisition purchase price           $ 3,214  
Ownership interest [5]       80.00%      
JGC [Member] | Solacor 1/2 [Member]              
Nature of the business [Abstract]              
Ownership interest     13.00%   13.00%    
[1] Algerian Energy Company, SPA owns 49% of Honaine and Valoriza Agua, S.L. owns the remaining 25.5%.
[2] Algerian Energy Company, SPA owns 49% of Skikda and Valoriza Agua, S.L. owns the remaining 16.83%.
[3] Kaxu is owned by the Company (51%), Industrial Development Corporation of South Africa (29%) and Kaxu Community Trust (20%).
[4] JGC, a Japanese engineering company, holds 13% of the shares in each of Solacor 1 and Solacor 2.
[5] Instituto para la Diversificacion y Ahorro de la Energia ("Idae"), a Spanish state owned company, holds 20% of the shares in Seville PV.