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Long-term debt - Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 1,768,853 $ 1,458,286
Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 75,165 101,226
Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 158,026 167,084
Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,535,662 $ 1,189,976
Carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,789,258  
Carrying amount | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 39,377  
Carrying amount | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 40,680  
Carrying amount | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 276,819  
Carrying amount | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 10,778  
Carrying amount | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 310,841  
Carrying amount | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,110,763  
Carrying amount | Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 77,683  
Carrying amount | Egypt limited recourse debt facilities | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 29,525  
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 | 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 161,575  
Carrying amount | Other limited recourse debt facilities | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 9,852  
Carrying amount | Other limited recourse debt facilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 9,128  
Carrying amount | Other limited recourse debt facilities | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 10,213  
Carrying amount | Other limited recourse debt facilities | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 10,778  
Carrying amount | Other limited recourse debt facilities | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 10,841  
Carrying amount | Other limited recourse debt facilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 110,763  
Carrying amount | Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,550,000  
Carrying amount | Unsecured notes | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
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 250,000  
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 | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 1,000,000