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Income Taxes - Components of income tax expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Current tax expense (recovery) |  |
Recognized in profit or loss in current year | $ 66,345 | $ 44,751
Change in current tax expense estimated for prior years | (3,468) | (720)
Current tax expense (income) and adjustments for current tax of prior periods | 62,877 | 44,031
Deferred tax expense (recovery) |  |
Deferred tax (recovery) expense recognized in the current year | (898) | 27,942
Adjustments recognized in the current year with respect to prior years | (1,539) | 1,124
Adjustments to deferred tax attributable to changes in tax rates and laws | 0 | 1,302
Increase in deferred tax liabilities due to tax impact of reversals of mineral properties, plant, and equipment impairments (Note 10,11) | 17,770 | 0
Recognition of previously unrecognized deferred tax assets | (10,275) | 0
Benefit from previously unrecognized losses, and other temporary differences | (6,487) | (7,861)
Increase in deferred tax liabilities due to tax impact of net realizable value (charge) reversal to inventory (Note 21) | (2,414) | 7,908
Deferred tax expense | (3,843) | 30,415
Income taxes expense | $ 59,034 | $ 74,446

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