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Business combinations, 2019 (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Oct. 22, 2019
Aug. 02, 2019
May 24, 2019
Business combinations [Abstract]          
Investments carried under the equity method $ 116,746 $ 139,925      
Asset Acquisition [Member]          
Asset Acquisition [Abstract]          
Concessional assets 162,489 28,738      
Current assets 29,445 1,503      
Deferred tax liabilities   (2,539)      
Other current and non-current liabilities (4,378) (1,512)      
Asset acquisition - purchase price (22,610) (26,190)      
Net result of the asset acquisition $ 0 $ 0      
Amherst Island [Member]          
Business combinations [Abstract]          
Investments carried under the equity method         $ 4,900
Amherst Island [Member] | Algonquin [Member]          
Business combinations [Abstract]          
Investments carried under the equity method         $ 92,300
Monterrey [Member]          
Business combinations [Abstract]          
Investments carried under the equity method       $ 17,000  
Percentage interest acquired       30.00%  
ASI Ops [Member]          
Business combinations [Abstract]          
Investments carried under the equity method       $ 6,000  
Percentage interest acquired       100.00%  
ATN2 [Member]          
Business combinations [Abstract]          
Investments carried under the equity method     $ 20,000