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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 |

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