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Stock based compensation (Details 5) (EUR €)
12 Months Ended
Dec. 31, 2012
Stock Option One [Member]
 
Number of shares, Stock Options Outstanding 195,000
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 8 years 5 months 12 days
Stock Options Outstanding, Weighted average exercise price in euros € 3.28
Stock Options Outstanding, Weighted average intrinsic value in euros € 0
Stock Options Exercisable, Number of shares 48,750
Stock Options Exercisable, Weighted average exercise price in euros € 3.28
Stock Options Exercisable, Weighted average intrinsic value in euros € 0
Stock Option One [Member] | Minimum [Member]
 
Range of exercise prices in euros € 0
Stock Option One [Member] | Maximum [Member]
 
Range of exercise prices in euros € 3.28
Stock Option Two [Member]
 
Number of shares, Stock Options Outstanding 1,385,000
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 7 years 0 months 14 days
Stock Options Outstanding, Weighted average exercise price in euros € 4.73
Stock Options Outstanding, Weighted average intrinsic value in euros € 0
Stock Options Exercisable, Number of shares 735,000
Stock Options Exercisable, Weighted average exercise price in euros € 4.74
Stock Options Exercisable, Weighted average intrinsic value in euros € 0
Stock Option Two [Member] | Minimum [Member]
 
Range of exercise prices in euros € 4.03
Stock Option Two [Member] | Maximum [Member]
 
Range of exercise prices in euros € 5.44
Stock Option Three [Member]
 
Number of shares, Stock Options Outstanding 123,500
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 1 year 7 months 13 days
Stock Options Outstanding, Weighted average exercise price in euros € 10.93
Stock Options Outstanding, Weighted average intrinsic value in euros € 0
Stock Options Exercisable, Number of shares 123,500
Stock Options Exercisable, Weighted average exercise price in euros € 10.93
Stock Options Exercisable, Weighted average intrinsic value in euros € 0
Stock Option Three [Member] | Minimum [Member]
 
Range of exercise prices in euros € 6.40
Stock Option Three [Member] | Maximum [Member]
 
Range of exercise prices in euros € 12.02
Stock Option Four [Member]
 
Number of shares, Stock Options Outstanding 1,040,990
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 2 years 7 months 6 days
Stock Options Outstanding, Weighted average exercise price in euros € 14.46
Stock Options Outstanding, Weighted average intrinsic value in euros € 0
Stock Options Exercisable, Number of shares 1,040,990
Stock Options Exercisable, Weighted average exercise price in euros € 14.46
Stock Options Exercisable, Weighted average intrinsic value in euros € 0
Stock Option Four [Member] | Minimum [Member]
 
Range of exercise prices in euros € 12.86
Stock Option Four [Member] | Maximum [Member]
 
Range of exercise prices in euros € 16.23
Stock Option Five [Member]
 
Number of shares, Stock Options Outstanding 528,000
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 2 years 6 months 29 days
Stock Options Outstanding, Weighted average exercise price in euros € 22.85
Stock Options Outstanding, Weighted average intrinsic value in euros € 0
Stock Options Exercisable, Number of shares 528,000
Stock Options Exercisable, Weighted average exercise price in euros € 22.85
Stock Options Exercisable, Weighted average intrinsic value in euros € 0
Stock Option Five [Member] | Minimum [Member]
 
Range of exercise prices in euros € 19.2
Stock Option Five [Member] | Maximum [Member]
 
Range of exercise prices in euros € 25.39
Stock Option [Member]
 
Number of shares, Stock Options Outstanding 3,272,490
Stock Options Outstanding, Weighted average remaining contractual life (in Years) 4 years 4 months 2 days
Stock Options Outstanding, Weighted average exercise price in euros € 10.90
Stock Options Outstanding, Weighted average intrinsic value in euros € 0.00
Stock Options Exercisable, Number of shares 2,476,240
Stock Options Exercisable, Weighted average exercise price in euros € 12.97
Stock Options Exercisable, Weighted average intrinsic value in euros € 0.00