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Non-current assets held for sale and discontinued operations - Discontinued operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 30, 2019
Dec. 31, 2019
Disclosure of analysis of single amount of discontinued operations [line items]    
Gain on disposal of discontinued operation   $ 85,101
Spanish Hydroelectric Business, Disposal Group And Discontinued Operation    
Disclosure of analysis of single amount of discontinued operations [line items]    
Cash proceeds $ 177,627  
Gain on disposal of discontinued operation $ 85,102 $ 85,102