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Other intangible assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | $ 58,658 | $ 62,839 |
Additions | 1,992 | 5,904 |
Disposals | (7,324) | (13,739) |
Business combinations (Note 5) | 45 |  |
Exchange differences | (1,549) | 3,654 |
Other intangible assets at end of the year | 51,822 | 58,658 | $ 62,839
Impairment of intangible assets | 16,073 | 443 | 230
Intangible assets pledged as security | 26,948 |  |
Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | (72,751) | (54,629) |
Additions | (9,312) | (8,440) |
Disposals |  | 565 |
Transfers from/(to) other accounts |  | 3,894 |
Exchange differences | 2,546 | (6,353) |
Other intangible assets at end of the year | (79,517) | (72,751) | (54,629)
Accumulated impairment |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | (10,258) | (8,666) |
Additions | (16,073) | (443) |
Exchange differences | 718 | (1,149) |
Other intangible assets at end of the year | (25,613) | (10,258) | (8,666)
Other segments |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 10,048 |  |
Other intangible assets at end of the year | 1,256 | 10,048 |
Other segments | Spain |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Impairment of intangible assets | 13,947 |  |
Capitalised development expenditure | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 50,482 | 40,354 |
Additions | 992 | 260 |
Transfers from/(to) other accounts | 1,919 | (4,044) |
Exchange differences | (2,408) | 5,824 |
Other intangible assets at end of the year | 50,985 | 50,482 | 40,354
Power Supply Agreements | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 37,836 | 37,836 |
Other intangible assets at end of the year | 37,836 | 37,836 | 37,836
Rights of use | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 23,039 | 20,345 |
Additions |  | 55 |
Exchange differences | (648) | 2,639 |
Other intangible assets at end of the year | 22,391 | 23,039 | 20,345
Computer software | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 6,047 | 5,815 |
Disposals | (64) | (10) |
Business combinations (Note 5) | 45 |  |
Exchange differences | (101) | 242 |
Other intangible assets at end of the year | 5,927 | 6,047 | 5,815
Other intangible assets | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Other intangible assets at beginning of the year | 24,263 | 21,784 |
Additions | 26,385 | 14,472 |
Disposals | (7,260) | (14,294) |
Transfers from/(to) other accounts | (1,919) | 150 |
Exchange differences | (1,656) | 2,451 |
Other intangible assets at end of the year | $ 39,813 | $ 24,263 | $ 21,784

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