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Property, plant and equipment - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment   $ 1,493,220 $ 1,480,439 $ 831,377
Borrowing costs capitalized   13,904 3,660  
Net book value of pledged assets   324,129 265,099  
IAS 16        
Disclosure of detailed information about property, plant and equipment [line items]        
Increase (decrease) in property, plant and equipment $ 545,000      
Farmlands        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment   709,585 $ 780,184 $ 110,743
Property, plant and equipment, cost   235,000    
Farmlands | IAS 16        
Disclosure of detailed information about property, plant and equipment [line items]        
Increase (decrease) in property, plant and equipment   $ (71,000)