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CURRENT AND DEFERRED INCOME TAX - Unrecognized Deductible Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences $ 600,757 $ 642,417
Inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences 11,237 4,063
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences 79,336 116,852
Close down and restoration provision    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences 38,027 37,717
Carry forward tax loss and tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences 396,830 420,007
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deductible temporary differences $ 75,327 $ 63,778