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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings per share [abstract]  
Earnings per share
 
2017
 
2016
 
2015
Profit/(Loss) from operations attributable to equity holders of the Group
9,972

 
2,039

 
(5,593
)
Weighted average number of shares in issue (thousands)
120,599

 
121,421

 
120,901

Basic earnings / (loss) per share from operations
0.083

 
0.017

 
(0.046
)
 
2017
 
2016
 
2015
Profit / (Loss) from operations attributable to equity holders of the Group
9,972

 
2,039

 
(5,593
)
Weighted average number of shares in issue (thousands)
120,599

 
121,421

 
120,901

Adjustments for:
 
 
 
 
 
- Employee share options and restricted units (thousands)
1,604

 
1,695

 
1,445

Weighted average number of shares for diluted earnings per share (thousands)
122,203

 
123,116

 
122,346

Diluted earnings / (loss) per share from operations
0.082

 
0.017

 
(0.046
)