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Capital disclosures (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of liquidity and capitalization [Line Items]      
Cash and cash equivalents $ 416,763,000 $ 256,077,000 $ 375,479,000
Total liquidity 1,516,763,000 556,077,000  
Total debt 1,768,853,000 1,458,286,000  
Non-controlling interests 298,675,000 296,628,000  
Shareholders’ equity 1,331,685,000 1,511,213,000  
Total capitalization $ 3,399,213,000 $ 3,266,127,000  
Total debt to capitalization 52.00% 45.00%  
Net debt to capitalization 45.00% 40.00%  
Revolving credit facility      
Disclosure of liquidity and capitalization [Line Items]      
Undrawn credit facilities $ 300,000,000 $ 300,000,000  
Construction facilities      
Disclosure of liquidity and capitalization [Line Items]      
Undrawn credit facilities 800,000,000 0  
Unsecured notes      
Disclosure of liquidity and capitalization [Line Items]      
Total debt 1,535,662,000 1,189,976,000  
Egypt limited recourse debt facilities      
Disclosure of liquidity and capitalization [Line Items]      
Total debt $ 75,165,000 $ 101,226,000  
Ownership of subsidiary, percentage of inclusion 100.00% 100.00%  
Other limited recourse debt facilities      
Disclosure of liquidity and capitalization [Line Items]      
Total debt $ 158,026,000 $ 167,084,000