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Long-term debt - Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 1,458,286 $ 1,502,271
Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 101,226 241,190
Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 167,084 72,918
Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,189,976 $ 1,188,163
Carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,475,851  
Carrying amount | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 385,992  
Carrying amount | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 39,977  
Carrying amount | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 40,681  
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 | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 721,604  
Carrying amount | Egypt limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 105,323  
Carrying amount | Egypt limited recourse debt facilities | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 27,640  
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 | 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 170,528  
Carrying amount | Other limited recourse debt facilities | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 8,352  
Carrying amount | Other limited recourse debt facilities | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 10,452  
Carrying amount | Other limited recourse debt facilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 9,129  
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 | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 121,604  
Carrying amount | Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,200,000  
Carrying amount | Unsecured notes | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 350,000  
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 | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 600,000