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Long-term debt - Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 2,363,372 $ 1,768,853
Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 46,948 75,165
Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 160,964 158,026
Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,979,125 1,535,662
Construction Facility    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 176,335 $ 0
Carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 2,385,416  
Carrying amount | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 40,376  
Carrying amount | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 28,384  
Carrying amount | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,424  
Carrying amount | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 485,576  
Carrying amount | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,654  
Carrying amount | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,805,002  
Carrying amount | Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 48,158  
Carrying amount | Egypt limited recourse debt facilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 31,552  
Carrying amount | Egypt limited recourse debt facilities | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 16,606  
Carrying amount | Egypt limited recourse debt facilities | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Egypt limited recourse debt facilities | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Egypt limited recourse debt facilities | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Egypt limited recourse debt facilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 164,258  
Carrying amount | Other limited recourse debt facilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 8,824  
Carrying amount | Other limited recourse debt facilities | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 11,778  
Carrying amount | Other limited recourse debt facilities | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,424  
Carrying amount | Other limited recourse debt facilities | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,576  
Carrying amount | Other limited recourse debt facilities | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,654  
Carrying amount | Other limited recourse debt facilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 105,002  
Carrying amount | Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 2,000,000  
Carrying amount | Unsecured notes | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 300,000  
Carrying amount | Unsecured notes | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,700,000  
Carrying amount | Construction Facility    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 173,000  
Long-term debt exceeding principal payment 3,300  
Carrying amount | Construction Facility | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Construction Facility | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Construction Facility | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Construction Facility | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 173,000  
Carrying amount | Construction Facility | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Construction Facility | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 0