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Leases (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of finance lease and operating lease by lessee [abstract] |
Schedule of non-current and current obligations under finance leases | Obligations under finance leases comprise the following at December 31:
|  | 2018 |  | 2017
|  | Non- |  |  |  |  |  | Non- |  |  |  |
|  | Current |  | Current |  | Total |  | Current |  | Current |  | Total
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Hydroelectrical installations (including power lines and concessions) |  | 52,428 |  | 12,577 |  | 65,005 |  | 68,088 |  | 12,551 |  | 80,639
Other finance leases |  | 1,044 |  | 422 |  | 1,466 |  | 1,625 |  | 369 |  | 1,994
Total |  | 53,472 |  | 12,999 |  | 66,471 |  | 69,713 |  | 12,920 |  | 82,633
Schedule of non-current payment obligations under finance leases by maturity | The detail, by maturity, of the non-current payment obligations under finance leases as of December 31, 2018 is as follows:
|  | 2020 |  | 2021 |  | 2022 |  | Total
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Hydroelectrical installations (including power lines and concessions) |  | 13,199 |  | 13,849 |  | 25,380 |  | 52,428
Other finance leases |  | 618 |  | 426 |  | — |  | 1,044
Total |  | 13,817 |  | 14,275 |  | 25,380 |  | 53,472
Schedule of minimum lease payments under finance lease | Future net minimum lease payments under finance leases together with the future finance charges are as follows:
|  | Undiscounted minimum lease payments |  | Present value of minimum lease payments
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Within 1 year |  | 13,362 |  | 13,281 |  | 12,999 |  | 12,920
Between 1 and 5 years |  | 61,556 |  | 82,683 |  | 53,472 |  | 69,713
After 5 years |  | — |  | — |  | — |  | —
Total minimum lease payments |  | 74,918 |  | 95,964 |  | 66,471 |  | 82,633
Less: amounts representing finance lease charges |  | 8,447 |  | 13,331 |  | — |  | —
Present value of minimum lease payments |  | 66,471 |  | 82,633 |  | 66,471 |  | 82,633
Schedule of minimum lease payments on operating leases by maturity | Expenses associated with operating leases are recorded in Other Operating Expenses in the consolidated income statement, and the minimum lease payments on operating leases at December 31, are as follows:
|  | 2018 |  | 2017
|  | US$'000 |  | US$'000
Within one year |  | 9,684 |  | 12,105
Between one and five years |  | 20,847 |  | 27,277
After five years |  | 732 |  | 3,347
Total |  | 31,263 |  | 42,729

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