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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current tax expense (recovery)    
Recognized in profit or loss in current year $ 134,947 $ 99,013
Change in current tax expense estimated for prior years 147 (658)
Current tax expense (income) and adjustments for current tax of prior periods 135,094 98,355
Deferred tax expense (recovery)    
Deferred tax recovery recognized in the current year 14,194 14,667
Adjustments recognized in the current year with respect to prior years 56 433
Benefit from previously unrecognized losses, and other temporary differences 508 (42,379)
Decrease in deferred tax liabilities due to tax impact of NRV charge to inventory (3,423) 4,481
Deferred tax expense 11,335 (22,798)
Income taxes expense $ 146,429 $ 75,557