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Share-based payment - Legacy programs - Stock Options (Details) - Stock Option
12 Months Ended
Dec. 31, 2018
EUR (€)
Options
plan
shares
Dec. 31, 2017
EUR (€)
Options
Dec. 31, 2016
EUR (€)
Options
Dec. 31, 2015
EUR (€)
Options
Share-based payment        
Number of global plans | plan 1      
Number of shares per option | shares 1      
Balanced at beginning of period (in shares) | Options 447,500 1,601,021 3,640,286  
Shares exercised | Options (424,500) (415,750) (832,900)  
Shares forfeited | Options   (215,000) (17,875)  
Shares expired | Options   (522,771) (1,188,490)  
Balance at end of period (in shares) | Options 23,000 447,500 1,601,021  
Weighted average exercise price at beginning of period € 2.07 € 3.34 € 4.67  
Weighted average exercise price - exercised 2.06 2.13 2.52  
Weighted average exercise price - forfeited   2.71 2.57  
Weighted average exercise price - expired   5.65 7.81  
Weighted average exercise price at end of period 2.35 2.07 3.34  
Weighted average share price € 5.07 € 4.93 € 4.87  
Number of options exercisable | Options 23,000 447,500 1,197,771 2,318,911
Weighted average exercise price of exercisable options € 2.35 € 2.07 € 3.56 € 5.97