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Income taxes - Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes      
Current $ 9,548 $ 6,600 $ 2,761
Deferred 450 (1,779) 394
Total income tax expense $ 9,998 $ 4,821 $ 3,155