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Income taxes - Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Current income tax expense $ 17,061 $ 46,811 $ 47,488
Deferred income tax expense 471 (7,974) 648
Income tax expense $ 17,532 $ 38,837 $ 48,136