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Income and expenses - Depreciation and Amortization charges (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.