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Income and expenses - Depreciation and Amortization charges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Depreciation and amortization charges, operating allowances and write-downs |  |  |  |  |
Amortization of intangible assets (Note 8) | $ 9,312 | $ 8,440 |  | $ 12,649 |
Depreciation of property, plant and equipment (Note 9) | 109,832 | 94,051 |  | 105,695 |
Other write-downs and reversals | (7) | 2,038 |  | 7,333 |
Depreciation and amortization charges, operating allowances and write-downs | 119,137 | 104,529 | [1] | 125,677 | [1]
Accumulated impairment |  |  |  |  |
Depreciation and amortization charges, operating allowances and write-downs |  |  |  |  |
Change in impairment losses on uncollectible trade receivables (Note 10) | $ (3,190) | $ 1,784 |  | $ 7,578 |
[1] | The amounts for 2016 have been re-presented to show the results of the Spanish energy business within profit (loss) from continuing operations, as described in Note 1 to the consolidated financial statements.

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