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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based compensation        
Total $ 3,279 $ 6,170 $ 12,720 $ 19,976
Cost of Sales        
Share-based compensation        
Total 513 740 1,603 1,898
Research and Development Expense        
Share-based compensation        
Total 709 849 2,728 1,986
Selling, General and Administrative Expenses        
Share-based compensation        
Total 1,890 3,714 7,393 10,182
Restructuring        
Share-based compensation        
Total $ 167 $ 867 $ 996 1,707
Acquisition costs        
Share-based compensation        
Total       $ 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 options        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,394  
Expired or forfeited (in shares)     (147)  
Outstanding at the end of the period (in shares) 1,247   1,247  
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 34.97  
Expired or forfeited (in dollars per share)     36.50  
Outstanding at the end of the period (in dollars per share) $ 34.79   $ 34.79  
Non-vested restricted shares and performance shares        
Number of Shares        
Outstanding at the beginning of the period (in shares)     1,880  
Granted (in shares)     835  
Performance award adjustments (in shares)     (5)  
Vested (in shares)     (508)  
Forfeited (in shares)     (253)  
Outstanding at the end of the period (in shares) 1,949   1,949  
Weighted Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share)     $ 25.41  
Granted (in dollars per share)     19.31  
Performance award adjustments (in dollars per share)     32.67  
Vested (in dollars per share)     26.44  
Forfeited (in dollars per share)     24.83  
Outstanding at the end of the period (in dollars per share) $ 22.59   $ 22.59