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Provisions and other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Provisions and other long-term liabilities |
Schedule of Provisions and Other Long-term Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset retirement | ​ | Deferred | ​ | ​ | ​ | ​
Amounts in US$ ‘000 | ​ | obligation | ​ | Income | ​ | Other | ​ | Total
As of January 1, 2021 | ​ | 64,040 | ​ | 3,828 | ​ | 14,502 | ​ | 82,370
Addition to provision / changes in estimates | ​ | (651) | ​ | (46) | ​ | 59 | ​ | (638)
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
Addition to provision / changes in estimates | ​ | (4,942) | ​ | — | ​ | (2,670) | ​ | (7,612)
Exchange difference | ​ | (669) | ​ | (167) | ​ | (1,147) | ​ | (1,983)
Foreign currency translation | ​ | (577) | ​ | — | ​ | 14 | ​ | (563)
Amortization | ​ | — | ​ | (2,407) | ​ | — | ​ | (2,407)
Unwinding of discount | ​ | 2,641 | ​ | — | ​ | 547 | ​ | 3,188
Amounts used during the year | ​ | (1,392) | ​ | — | ​ | (132) | ​ | (1,524)
As of December 31, 2022 | ​ | 40,903 | ​ | 757 | ​ | 10,287 | ​ | 51,947
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