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Equity - Changes in non-controlling interests (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity at beginning of period | $ 937,758 | $ 892,042 |  | $ 1,294,973 |
Loss for the year | (19,088) | (5,144) | [1] | (20,186) | [1]
Dividends paid to joint venture partner | (20,642) | (7,350) |  |  |
Non-controlling interest arising on the acquisition |  | 6,750 |  |  |
Translation differences and other |  | (205) |  | 4,716 |
Equity at end of period | 884,372 | 937,758 |  | 892,042 |
Noncontrolling interests |  |  |  |  |
Equity at beginning of period | 121,734 | 125,556 |  | 141,823 |
Loss for the year | (19,088) | (5,144) |  |  |
Dividends paid to joint venture partner |  | (7,350) |  |  |
Non-controlling interest arising on the acquisition | 14,389 | 6,750 |  |  |
Increase of Parent's ownership interest | 14,389 |  |  |  |
Translation differences and other | (890) | 1,922 |  | 3,919 |
Equity at end of period | $ 116,145 | $ 121,734 |  | $ 125,556 |
[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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