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Income and other taxes - Net deferred income tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net $ (75,868) $ (161,206) $ (217,153)
Deferred tax assets 137,524 111,614 60,065
Deferred tax liabilities (213,392) (272,820) $ (277,218)
Property, plant and equipment (owned)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (448,533) (447,077)  
Deferred tax assets (262,020) (250,890)  
Deferred tax liabilities (186,513) (196,187)  
Right-of-use assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (43,386) (45,501)  
Deferred tax assets (35,297) (26,725)  
Deferred tax liabilities (8,089) (18,776)  
Repatriation taxes      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (102,370) (93,363)  
Deferred tax assets 0 0  
Deferred tax liabilities (102,370) (93,363)  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (15,205) (10,424)  
Deferred tax assets 0 (48)  
Deferred tax liabilities (15,205) (10,376)  
Temporary differences including temporary differences with liability balances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (609,494) (596,365)  
Deferred tax assets (297,317) (277,663)  
Deferred tax liabilities (312,177) (318,702)  
Non-capital loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 391,132 286,004  
Deferred tax assets 339,396 286,004  
Deferred tax liabilities 51,736 0  
Lease obligations      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 56,894 56,802  
Deferred tax assets 44,455 33,979  
Deferred tax liabilities 12,439 22,823  
Share-based compensation      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 14,669 3,075  
Deferred tax assets 1,758 0  
Deferred tax liabilities 12,911 3,075  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 70,931 89,278  
Deferred tax assets 49,232 69,294  
Deferred tax liabilities 21,699 19,984  
Temporary differences including temporary differences with asset balances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 533,626 435,159  
Deferred tax assets 434,841 389,277  
Deferred tax liabilities $ 98,785 $ 45,882