Share-based compensation (Tables)

3 Months Ended

Mar. 31, 2016

Share-based compensation

Schedule of share-based compensation expense

	Three months ended March 31,
	2016		2015
	(in thousands)
Cost of sales	$	546	$	601
Selling, general, and administrative	2,743		2,798
Research and development	1,099		599
Total	$	4,388	$	3,998

Summary of stock option activity

	Number of		Weighted Average
	Shares		Exercise Price
	(in thousands)
Balance - December 31, 2015	2,064		$	32.91
Granted	—		—
Exercised	(13	)	12.00
Expired or forfeited	(32	)	35.43
Balance - March 31, 2016	2,019		$	33.00

Summary of restricted share activity

			Weighted Average
	Number of		Grant Date
	Shares		Fair Value
	(in thousands)
Balance - December 31, 2015	1,398		$	31.97
Granted	49		19.54
Released	(7	)	31.19
Forfeited	(13	)	32.36
Balance - March 31, 2016	1,427		$	31.55