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Share-based compensation - 2012 Plan (Details) - 2012 Plan - Share options $ in Thousands |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Feb. 15, 2012 | Dec. 31, 2016 USD ($) € / shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) € / shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 shares
Share-based compensation |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |
Options granted (in shares) |  |  | 0 |  | 0 | 0 | 1,907,815
Options |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 1,077,944 |  |  |  |
Exercised (in shares) |  |  | (510,547) |  | (449,838) | (152,724) |
Expired (in shares) |  |  | (84,391) |  |  |  |
Outstanding at end of year (in shares) |  |  | 483,006 |  | 1,077,944 |  |
Weighted average exercise price |  |  |  |  |  |  |
Outstanding at beginning of year (in euros/dollars per share) | € / shares |  | € 4.02 |  |  |  |  |
Exercised (in euros per share) | € / shares |  | 3.12 |  |  |  |  |
Expired (in dollars per share) | € / shares |  | 3.07 |  |  |  |  |
Outstanding at end of year (in euros/dollars per share) | € / shares |  | € 5.13 |  | € 4.02 |  |  |
Weighted average remaining contractual life (in years) |  |  |  |  |  |  |
Outstanding |  |  | 4 years 1 month 17 days |  | 4 years 1 month 24 days |  |
Aggregate intrinsic value |  |  |  |  |  |  |
Outstanding (in dollars) | $ |  | € 810 | $ 810 | € 13,114 | $ 13,114 |  |
Exercised (in dollars) | $ |  |  | $ 4,381 |  | $ 9,272 | $ 1,357 |
One year from grant date |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |  |
Year two and three from grant date |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |
Vesting percentage | 66.66% |  |  |  |  |  |

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