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Shareholders' contributions (Tables) | 12 Months Ended
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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.

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