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Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 1,692,162 $ 1,351,577
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on debt $ 130,600 76,000
Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 76,691 106,709
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 800 1,100
Unsecured notes | Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 1,535,662 1,189,976
Egypt limited recourse debt facilities | Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 75,165 101,226
Other limited recourse debt facilities | Fixed interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt 156,500 161,601
Other limited recourse debt facilities | Variable interest rate    
Disclosure of financial instruments by type of interest rate [line items]    
Long-term debt $ 1,526 $ 5,483