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Net intangible assets and goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Total cost $ 103,046 $ 106,606  
Total accumulated amortization (71,601) (70,345)  
Subtotal 31,445 36,261  
Goodwill 5,601 6,783  
Net intangible assets including goodwill 37,046 43,044  
Total amortization expense 11,822 11,580 $ 11,310
Estimated aggregate amortization expense for 2021 12,581    
Estimated aggregate amortization expense for 2022 8,017    
Estimated aggregate amortization expense for 2023 2,714    
Estimated aggregate amortization expense for 2024 1,768    
Estimated aggregate amortization expense for 2025 1,739    
Estimated aggregate amortization expense for 2026 and thereafter 4,626    
Brazil      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 3,196 4,124  
Argentina      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 1,276 1,585  
Chile      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 1,047 988  
Colombia      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 82 86  
Computer software cost      
Finite-Lived Intangible Assets [Line Items]      
Total cost 69,999 75,224  
Initial franchise fees      
Finite-Lived Intangible Assets [Line Items]      
Total cost 14,223 16,146  
Reacquired franchised rights      
Finite-Lived Intangible Assets [Line Items]      
Total cost 16,884 13,296  
Letter of credit fees      
Finite-Lived Intangible Assets [Line Items]      
Total cost 940 940  
Others      
Finite-Lived Intangible Assets [Line Items]      
Total cost $ 1,000 $ 1,000