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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current tax expense (recovery)    
Recognized in profit or loss in current year $ 99,013 $ 95,219
Change in current tax expense estimated for prior years (658) (3,090)
Current tax expense (income) and adjustments for current tax of prior periods 98,355 92,129
Deferred tax expense (recovery)    
Deferred tax recovery recognized in the current year 14,667 (13,079)
Adjustments recognized in the current year with respect to prior years 433 (5,003)
Benefit from previously unrecognized losses, and other temporary differences (42,379) 0
Decrease in deferred tax liabilities due to tax impact of NRV charge to inventory 4,481 (2,779)
Deferred tax expense (22,798) (20,861)
Income taxes expense $ 75,557 $ 71,268