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Equity - Changes in non-controlling interests (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.