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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings per share [abstract]  
Earnings per share
 
2018
 
2017
 
2016
(Loss) / Profit from operations attributable to equity holders of the Group
(24,622
)
 
13,198

 
11,568

Weighted average number of shares in issue (thousands)
116,637

 
120,599

 
121,421

Basic (loss) / earnings per share from operations
(0.211
)
 
0.109

 
0.095

 
2018
 
2017
 
2016
(Loss) / Profit from operations attributable to equity holders of the Group
(24,622
)
 
13,198

 
11,568

Weighted average number of shares in issue (thousands)
116,637

 
120,599

 
121,421

Adjustments for:
 
 
 
 
 
- Employee share options and restricted units (thousands)
1,198

 
1,604

 
1,695

Weighted average number of shares for diluted earnings per share (thousands)
117,835

 
122,203

 
123,116

Diluted (loss) / earnings per share from operations
(0.211
)
 
0.108

 
0.094