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Business combinations, 2019 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 22, 2019
Aug. 02, 2019
Dec. 31, 2018
Nov. 27, 2018
Business combinations [Abstract]            
Investments carried under the equity method $ 116,614 $ 139,925     $ 53,419  
Algonquin [Member]            
Business combinations [Abstract]            
Percentage interest acquired           16.47%
Asset Acquisition [Member]            
Asset Acquisition [Abstract]            
Concessional assets (Note 6) 163,064 28,738        
Current assets 29,998 1,503        
Deferred tax liabilities (Note 18)   (2,539)        
Other current and non-current liabilities (4,881) (1,512)        
Total net assets acquired at fair value 22,610 26,190        
Asset acquisition - purchase price (22,610) (26,190)        
Net result of business combinations 0 0        
Revenue contributed by the acquisitions 22,500 300        
Amount of profit (loss) after tax 6,300 0        
Additional revenue amount 14,700 2,300        
Additional amount of loss after tax $ 3,700 $ (1,200)        
ASI Ops [Member]            
Business combinations [Abstract]            
Percentage interest acquired       100.00%    
Investments carried under the equity method       $ 6,000    
ATN2 [Member]            
Business combinations [Abstract]            
Investments carried under the equity method     $ 20,000