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Income and other taxes - Net deferred income tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net $ (164,091) $ (153,639) $ (223,757)
Deferred tax assets 102,341 137,341 61,881
Deferred tax liabilities (266,432) (290,980) $ (285,638)
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (403,705) (419,982)  
Deferred tax assets (189,368) (197,931)  
Deferred tax liabilities (214,337) (222,051)  
Repatriation taxes      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (87,239) (85,364)  
Deferred tax assets 0 0  
Deferred tax liabilities (87,239) (85,364)  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (11,670) (19,956)  
Deferred tax assets (3,740) (4,981)  
Deferred tax liabilities (7,930) (14,975)  
Temporary differences including temporary differences with liability balances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net (502,614) (525,302)  
Deferred tax assets (193,108) (202,912)  
Deferred tax liabilities (309,506) (322,390)  
Non-capital loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 244,576 280,931  
Deferred tax assets 244,576 280,931  
Deferred tax liabilities 0 0  
Share-based compensation      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 19,920 8,590  
Deferred tax assets 2,946 935  
Deferred tax liabilities 16,974 7,655  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 74,027 82,142  
Deferred tax assets 47,927 58,387  
Deferred tax liabilities 26,100 23,755  
Temporary differences including temporary differences with asset balances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net 338,523 371,663  
Deferred tax assets 295,449 340,253  
Deferred tax liabilities $ 43,074 $ 31,410