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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%