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Income tax - Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Major components of tax expense (income) [abstract]      
Current tax (expense) / income $ (2,033) $ (1,102) $ (2,939)
Deferred tax (expense) / income (4,946) 660 (47)
Total Income tax (expense) / income $ (6,979) $ (442) $ (2,986)