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Employee benefits - Cost of Service or Benefits Received (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee benefits      
Financial cost $ 255 $ 240 $ 280
Real loss in plan assets (363) (316) (637)
Settlement (1,627) 0 0
Amortization of prior year losses 0 0 326
Net periodic pension expenses $ (1,735) $ (76) $ (31)