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Stock-based compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table sets forth the stock-based compensation expense recognized in the Consolidated Statements of Income (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Cost of goods sold
$
788

 
$
881

 
$
1,820

 
$
2,351

Research and development
1,329

 
1,225

 
3,805

 
3,639

Selling, general and administrative
7,774

 
4,766

 
19,120

 
15,263

Stock-based compensation expense before income taxes
$
9,891

 
$
6,872

 
$
24,745

 
$
21,253


Stock-based compensation expense capitalized in the Consolidated Balance Sheets is as follows (in thousands):
 
September 30,
 
2017
 
2016
Capitalized in inventory
$
1,074

 
$
585