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Income tax - Income tax rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax      
Corporate income tax rate 30.00% 30.00% 30.00%
Employee wages and benefits tax deductible (as a percent) 47.00%    
Withholding tax on dividends distributions (as a percent) 10.00%    
Consolidated basis tax income $ 59,984 $ 53,293 $ 59,472
Maximum      
Income tax      
Employee wages and benefits tax deductible (as a percent) 53.00%    
Guatemala      
Income tax      
Corporate income tax rate 25.00% 25.00%  
Costa Rica      
Income tax      
Corporate income tax rate   30.00%  
Period in which tax losses can be carried forward 3 years    
El Salvador      
Income tax      
Corporate income tax rate     30.00%
Mexico      
Income tax      
Period in which tax losses can be carried forward 10 years