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Financial instruments - fair values and risk management - Sensitivity analysis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sensitivity analysis    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10%   $ (3,938)
Increase (decrease) in equity and profit or loss due to weakening of USD by 10%   $ 3,938
Currency risk    
Sensitivity analysis    
Strengthening of USD by 10% 10.00% 10.00%
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% $ (1,833)  
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% 1,833  
Euro | Currency risk    
Sensitivity analysis    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% (1,787) $ (3,642)
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% 1,787 3,642
Russian Ruble | Currency risk    
Sensitivity analysis    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% (108) (296)
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% 108 $ 296
Armenian Dram | Currency risk    
Sensitivity analysis    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% 68  
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% (68)  
Kazakhstani Tenge | Currency risk    
Sensitivity analysis    
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% (6)  
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% $ 6