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Shareholders' contributions (Tables)
 12 Months Ended
Dec. 31, 2017
Statement of changes in equity [abstract]  
Disclosure of share capital
 
Number of shares
 
Share capital and
share premium
At January 1, 2015
122,382

 
1,116,617

Employee share options exercised (Note 23) (1)
—

 
1,786

Restricted shares and units vested (Note 23)
—

 
3,103

Purchase of own shares
—

 
(259
)
At December 31,2015
122,382

 
1,121,247

Employee share options exercised (Note 23) (1)
—

 
438

Restricted shares and units vested (Note 23)
—

 
3,225

Purchase of own shares
—

 
(4,087
)
At December 31,2016
122,382

 
1,120,823

Employee share options exercised (Note 23) (1)
—

 
50

Restricted shares units vested (Note 23)
—

 
4,149

Purchase of own shares
—

 
(32,515
)
At December 31,2017
122,382

 
1,092,507

 
(1)
Treasury shares were used to settle these options and units.