Stock-based compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2017		2016
Cost of goods sold	$	400	$	615
Research and development	1,177		1,181
Selling, general and administrative	4,669		4,292
Stock-based compensation expense before income taxes	$	6,246	$	6,088

Stock-based compensation expense capitalized in the Consolidated Balance Sheets is as follows (in thousands):

	March 31,
	2017		2016
Capitalized in inventory	$	902	$	790