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Basis of preparation - Effect of error correction on consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reclassifications or changes in presentation [line items]      
Inventories $ 178,163 $ 164,135  
Property, plant and equipment 4,003,211 4,042,199 $ 4,091,252
Deferred income tax liabilities   412,164  
Deficit (2,239,226) (2,103,206)  
Deferred income tax liabilities $ 439,195 414,554  
Cumulative Effect, Period of Adoption, Adjustment      
Disclosure of reclassifications or changes in presentation [line items]      
Deferred income tax liabilities   2,390  
Previously Reported [Member]      
Disclosure of reclassifications or changes in presentation [line items]      
Inventories   176,271  
Property, plant and equipment   3,998,493  
Deferred income tax liabilities   402,713  
Deficit   (2,125,326)  
Revision of Prior Period, Adjustment [Member]      
Disclosure of reclassifications or changes in presentation [line items]      
Inventories   (12,136)  
Property, plant and equipment   43,706  
Deferred income tax liabilities   9,451  
Deficit   $ 22,120