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Share-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based compensation        
Total $ 9,620 $ 4,002 $ 13,806 $ 8,390
Cost of sales        
Share-based compensation        
Total 500 486 1,157 1,032
Research and development        
Share-based compensation        
Total 708 940 1,137 2,039
Selling, general, and administrative        
Share-based compensation        
Total 3,368 $ 2,576 6,468 $ 5,319
Restructuring        
Share-based compensation        
Total 841   841  
Acquisition costs        
Share-based compensation        
Total $ 4,203   $ 4,203  
Restricted Stock Awards | Minimum        
Share-based compensation        
Expiration term     1 year  
Restricted Stock Awards | Maximum        
Share-based compensation        
Expiration term     5 years  
Stock option Awards        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,576  
Exercised (in shares)     (18)  
Expired or forfeited (in shares)     (120)  
Outstanding at the end of the period (in shares) 1,438   1,438  
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 35.18  
Exercised (in dollars per share)     30.03  
Expired or forfeited (in dollars per share)     37.14  
Outstanding at the end of the period (in dollars per share) $ 35.08   $ 35.08  
Restricted shares and performance shares        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,949  
Granted (in shares)     649  
Assumed from Ultratech (in shares)     338  
Vested (in shares)     (549)  
Forfeited (in shares)     (130)  
Outstanding at the end of the period (in shares) 2,257   2,257  
Weighted Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share)     $ 23.85  
Granted (in dollars per share)     29.67  
Assumed from Ultratech (in dollars per share)     31.75  
Vested (in dollars per share)     25.98  
Forfeited (in dollars per share)     25.95  
Outstanding at the end of the period (in dollars per share) $ 25.94   $ 25.94