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Provisions and other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Provisions And Other Long term Liabilities [Abstract] |
Schedule of Provisions and Other Long-term Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset retirement | ​ | Deferred | ​ | ​ | ​ | ​
Amounts in US$ ‘000 | ​ | obligation | ​ | Income | ​ | Other | ​ | Total
As of January 1, 2020 | ​ | 56,113 | ​ | 2,267 | ​ | 3,682 | ​ | 62,062
Addition to provision / changes in estimates | ​ | (1,812) | ​ | (258) | ​ | 1,904 | ​ | (166)
Acquisitions (Note 36.1) | ​ | 5,629 | ​ | 2,339 | ​ | 8,551 | ​ | 16,519
Exchange difference | ​ | 2,215 | ​ | (93) | ​ | 133 | ​ | 2,255
Foreign currency translation | ​ | (2,057) | ​ | — | ​ | — | ​ | (2,057)
Amortization | ​ | — | ​ | (387) | ​ | — | ​ | (387)
Unwinding of discount | ​ | 4,276 | ​ | — | ​ | 371 | ​ | 4,647
Amounts used during the year | ​ | (272) | ​ | (40) | ​ | (139) | ​ | (451)
Liabilities associated with assets held for sale | ​ | (52) | ​ | — | ​ | — | ​ | (52)
As of December 31, 2020 | ​ | 64,040 | ​ | 3,828 | ​ | 14,502 | ​ | 82,370
Addition to provision / changes in estimates | ​ | (651) | ​ | (46) | ​ | 59 | ​ | (638)
Acquisitions (Note 36.1) | ​ | — | ​ | — | ​ | — | ​ | —
Exchange difference | ​ | (668) | ​ | (228) | ​ | (1,079) | ​ | (1,975)
Foreign currency translation | ​ | (651) | ​ | — | ​ | (2) | ​ | (653)
Amortization | ​ | — | ​ | (223) | ​ | — | ​ | (223)
Unwinding of discount | ​ | 3,140 | ​ | — | ​ | 486 | ​ | 3,626
Amounts used during the year | ​ | (170) | ​ | — | ​ | (291) | ​ | (461)
Liabilities associated with assets held for sale | ​ | (19,198) | ​ | — | ​ | — | ​ | (19,198)
As of December 31, 2021 | ​ | 45,842 | ​ | 3,331 | ​ | 13,675 | ​ | 62,848

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