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Share-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation        
Total $ 6,170 $ 3,743 $ 19,976 $ 12,133
Cost of sales        
Share-based compensation        
Total 740 607 1,898 1,639
Research and development        
Share-based compensation        
Total 849 993 1,986 3,032
Selling, general, and administrative        
Share-based compensation        
Total 3,714 $ 2,143 10,182 $ 7,462
Restructuring        
Share-based compensation        
Total $ 867   1,707  
Acquisition costs        
Share-based compensation        
Total     $ 4,203  
Restricted share awards | Minimum        
Share-based compensation        
Expiration term     1 year  
Restricted share awards | Maximum        
Share-based compensation        
Expiration term     5 years  
Stock options        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,576  
Exercised (in shares)     (18)  
Expired or forfeited (in shares)     (129)  
Outstanding at the end of the period (in shares) 1,429   1,429  
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)     37.03  
Outstanding at the end of the period (in dollars per share) $ 35.07   $ 35.07  
Non-vested restricted shares and performance shares        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,949  
Granted (in shares)     642  
Assumed from Ultratech (in shares)     338  
Vested (in shares)     (695)  
Forfeited (in shares)     (173)  
Outstanding at the end of the period (in shares) 2,061   2,061  
Weighted Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share)     $ 23.85  
Granted (in dollars per share)     29.35  
Assumed from Ultratech (in dollars per share)     31.75  
Vested (in dollars per share)     27.12  
Forfeited (in dollars per share)     26.39  
Outstanding at the end of the period (in dollars per share) $ 25.85   $ 25.85