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Segmented information - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Property, plant and equipment $ 3,435,764 $ 3,576,195 $ 3,025,095
Adjustment Due to IFRS 16 410,669    
United States      
Disclosure of geographical areas [line items]      
Property, plant and equipment 1,455,722 1,548,165 1,407,693
Adjustment Due to IFRS 16 48,029    
Egypt      
Disclosure of geographical areas [line items]      
Property, plant and equipment 695,281 657,961 680,730
Adjustment Due to IFRS 16 14,551    
New Zealand      
Disclosure of geographical areas [line items]      
Property, plant and equipment 315,351 282,493 314,281
Adjustment Due to IFRS 16 1,070    
Trinidad      
Disclosure of geographical areas [line items]      
Property, plant and equipment 142,894 146,273 142,045
Adjustment Due to IFRS 16 849    
Canada      
Disclosure of geographical areas [line items]      
Property, plant and equipment 126,488 127,075 126,488
Adjustment Due to IFRS 16 0    
Chile      
Disclosure of geographical areas [line items]      
Property, plant and equipment 142,181 145,892 132,494
Adjustment Due to IFRS 16 9,687    
WFS      
Disclosure of geographical areas [line items]      
Property, plant and equipment 490,694 602,344 207,840
Adjustment Due to IFRS 16 282,854    
Other      
Disclosure of geographical areas [line items]      
Property, plant and equipment 67,153 $ 65,992 $ 13,524
Adjustment Due to IFRS 16 $ 53,629