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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current tax expense (recovery)    
Recognized in profit or loss in current year $ 95,219 $ 59,056
Change in current tax expense estimated for prior years (3,090) (5,155)
Current tax expense (income) and adjustments for current tax of prior periods 92,129 53,901
Deferred tax expense (recovery)    
Deferred tax recovery recognized in the current year (13,079) (13,256)
Adjustments recognized in the current year with respect to prior years (5,003) (1,098)
Recognition of previously unrecognized deferred tax assets 0 (6,140)
Benefit from previously unrecognized losses, and other temporary differences 0 (3,600)
Decrease in deferred tax liabilities due to tax impact of NRV charge to inventory (2,779) (8,660)
Deferred tax expense (20,861) (32,754)
Income taxes expense $ 71,268 $ 21,147