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Share-based compensation - 2012 Plan (Details) - 3 months ended Mar. 31, 2017 - 2012 Plan - Share options
$ in Millions
€ / shares
USD ($)
shares
Options    
Outstanding at beginning of year (in shares) | shares   483,006
Exercised (in shares) | shares   (134,974)
Outstanding at end of year (in shares) | shares   348,032
Weighted average exercise price    
Outstanding at beginning of year (in euros/dollars per share) | € / shares € 5.13  
Exercised (in euros per share) | € / shares 3.07  
Outstanding at end of year (in euros/dollars per share) | € / shares € 5.92  
Proceeds from Stock Options Exercised | $   $ 0.4