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Shareholders' contributions (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement of changes in equity [abstract] |
Schedule of Share Capital |
| Number of shares |  | Share capital and share premium
At January 1, 2017 | 122,382 |  |  | 1,120,823 |
Employee share options exercised (Note 24) (1) | — |  |  | 50 |
Restricted shares and units vested (Note 24) | — |  |  | 4,149 |
Purchase of own shares | — |  |  | (32,515 | )
At December 31,2017 | 122,382 |  |  | 1,092,507 |
Restricted shares and units vested (Note 24) | — |  |  | 4,775 |
Purchase of own shares | — |  |  | (13,206 | )
At December 31,2018 | 122,382 |  |  | 1,084,076 |
Restricted shares units vested (Note 24) | — |  |  | 4,455 |
Purchase of own shares | — |  |  | (3,219 | )
At December 31,2019 | 122,382 |  |  | 1,085,312 |
(1) | Treasury shares were used to settle these options and units.

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