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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Income taxes      
Current $ 6,665 $ 9,548 $ 6,600
Deferred 611 450 (1,779)
Total income tax expense $ 7,276 $ 9,998 $ 4,821