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Employee benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of detailed information about provision for employee benefits [Abstract] |
Disclosure of detailed information about provision for employee benefits [Text Block] |
Classes of benefits and expenses by employee |  | As of December 31, 2020 |  |  | As of December 31, 2019 |
|  | ThUS$ |  |  | ThUS$ |
Current
Profit sharing and bonuses |  |  | 7,770 |  |  |  | - |
Performance bonds and operational targets |  |  | 1,326 |  |  |  | 16,387 |
Total |  |  | 9,096 |  |  |  | 16,387 |
Non-current
Profit sharing and bonuses |  |  | - |  |  |  | 8,026 |
Severance indemnity payments |  |  | 32,199 |  |  |  | 27,814 |
Total |  |  | 32,199 |  |  |  | 35,840 |
Disclosure of detailed information about post employment benefit obligations [Text Block] |
Reconciliation |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
Changes in the benefit obligation |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Benefit obligation at the beginning of the year |  |  | 9,586 |  |  |  | 8,657 |  |  |  | 8,755 |
Service cost |  |  | - |  |  |  | - |  |  |  | - |
Interest cost |  |  | 280 |  |  |  | 336 |  |  |  | 319 |
Actuarial loss |  |  | 506 |  |  |  | 984 |  |  |  | 63 |
Benefits paid |  |  | (508 | ) |  |  | (391 | ) |  |  | (480 | )
Total |  |  | 9,864 |  |  |  | 9,586 |  |  |  | 8,657 |
Reconciliation |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
Changes in the plan assets |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Fair value of plan assets at the beginning of the year |  |  | 8,754 |  |  |  | 8,404 |  |  |  | 8,751 |
Actual return (loss) in plan assets |  |  | 4,642 |  |  |  | 741 |  |  |  | 133 |
Benefits paid |  |  | (508 | ) |  |  | (391 | ) |  |  | (480 | )
Fair value of plan assets at the end of the year |  |  | 12,888 |  |  |  | 8,754 |  |  |  | 8,404 |
Financing status |  |  | 3,025 |  |  |  | (832 | ) |  |  | (253 | )
Items not yet recognized as net periodic pension cost components: |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss at the beginning of the year |  |  | (3,634 | ) |  |  | (3,022 | ) |  |  | (2,614 | )
Amortization during the year |  |  | 326 |  |  |  | 242 |  |  |  | 160 |
Net estimated gain or loss occurred during the year |  |  | 3,500 |  |  |  | (854 | ) |  |  | (568 | )
Adjustment to recognize the minimum pension obligation |  |  | 192 |  |  |  | (3,634 | ) |  |  | (3,022 | )
Service cost or benefits received during the year |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Service cost or benefits received during the year |  |  | - |  |  |  | - |  |  |  | - |
Interest cost in benefit obligation |  |  | 280 |  |  |  | 336 |  |  |  | 319 |
Actual return in plan assets |  |  | 4,642 |  |  |  | 741 |  |  |  | 133 |
Amortization of prior year losses |  |  | 326 |  |  |  | 242 |  |  |  | 160 |
Net gain during the year |  |  | 3,500 |  |  |  | (854 | ) |  |  | (568 | )
Net periodic pension expense |  |  | (31 | ) |  |  | (33 | ) |  |  | (159 | )
Disclosure of net defined benefit liability (asset) [text block] | As of December 31, 2020, and 2019, severance indemnities calculated at the actuarial value are as follows:
Staff severance indemnities |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | (27,814 | ) |  |  | (28,233 | ) |  |  | (27,445 | )
Current cost of Service |  |  | (3,804 | ) |  |  | (2,880 | ) |  |  | (1,529 | )
Interest cost |  |  | (1,486 | ) |  |  | (1,661 | ) |  |  | (1,658 | )
Actuarial gain/loss |  |  | (2,826 | ) |  |  | (2,514 | ) |  |  | (1,617 | )
Exchange rate difference |  |  | (1,513 | ) |  |  | 2,475 |  |  |  | 2,710 |
Benefits paid during the year |  |  | 5,244 |  |  |  | 4,999 |  |  |  | 1,306 |
Total |  |  | (32,199 | ) |  |  | (27,814 | ) |  |  | (28,233 | )
Disclosure of detailed information about employee Actuarial assumption rate [Text Block] | The liability recorded for staff severance indemnity is valued at the actuarial value method, using the following actuarial assumptions:
Actuarial assumptions |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |  |  | Annual/Years |
Mortality rate |  |  | RV - 2014 |  |  |  | RV - 2014 |  |  |  | RV - 2014 |  |  |  |  |
Actual annual interest rate |  |  | 3.65 | % |  |  | 3.68 | % |  |  | 4.64 | % |  |  |  |
Voluntary retirement rate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Men |  |  | 6.49 | % |  |  | 6.49 | % |  |  | 6.49 | % |  |  | Annual |
Women |  |  | 6.49 | % |  |  | 6.49 | % |  |  | 6.49 | % |  |  | Annual |
Salary increase |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | % |  |  | Annual |
Retirement age: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Men |  |  | 65 |  |  |  | 65 |  |  |  | 65 |  |  |  | Years |
Women |  |  | 60 |  |  |  | 60 |  |  |  | 60 |  |  |  | Years |
Disclosure Of Sensitivity Analysis For Actuarial Assumptions Explanatory [Text Block] | As of December 31, 2020, and 2019, the Company has conducted a sensitivity analysis of the main assumptions of the actuarial calculation, determining the following:
Sensitivity analysis as of December 31, 2020 |  | Effect + 100 basis points |  |  | Effect - 100 basis points |
|  | ThUS$ |  |  | ThUS$ |
Discount rate |  |  | (1,985 | ) |  |  | 2,234 |
Employee turnover rate |  |  | (261 | ) |  |  | 291 |
Sensitivity analysis as of December 31, 2019 |  | Effect + 100 basis points |  |  | Effect - 100 basis points |
|  | ThUS$ |  |  | ThUS$ |
Discount rate |  |  | (1,796 | ) |  |  | 2,021 |
Employee turnover rate |  |  | (236 | ) |  |  | 263 |

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