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v3.21.1

Shareholders' contributions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | 87 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Sep. 24, 2013
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Par value per share (USD per share) | $ 1.5 |  |  | $ 1.5 |
Authorized proportion of outstanding stock (as a percent) |  |  |  |  | 5.00%
Purchase of treasury shares | $ 4,365 | $ 4,263 | $ 15,725 |  |
Treasury stock (shares) | 5,084,864 |  |  | 5,084,864 |
Share Repurchase Program |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Stock repurchased under program (shares) |  |  |  | 9,957,078 |
Employee stock options exercised (shares) |  |  |  | 4,406,246 |
Purchase of treasury shares | $ 4,365 | $ 4,263 | $ 15,725 |  |

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