Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense Related to Stock Options, Performance Stock Units (PSUs), Restricted Stock Units (RSUs) and Restricted Stock

The following table summarizes the stock-based compensation expense related to stock options, performance stock units (PSUs), restricted stock units (RSUs) and restricted stock for the three months ended March 31, 2018 and 2017, which was recognized as follows:

	Three Months Ended
	March 31,
(In thousands)	2018			2017
Stock-based compensation expense included in cost of sales	$	95		$	91
Selling, general and administrative expense		1,035			1,016
Research and development expense		689			776
Stock-based compensation expense included in operating expenses		1,724			1,792
Total stock-based compensation expense		1,819			1,883
Tax benefit for expense associated with non-qualified options, PSUs, RSUs and restricted stock		(384	)		(380	)
Total stock-based compensation expense, net of tax	$	1,435		$	1,503

Summary of Stock Options Outstanding

The following table is a summary of our stock options outstanding as of December 31, 2017 and March 31, 2018 and the changes that occurred during the three months ended March 31, 2018:

(In thousands, except per share amounts)	Number of Stock Options			Weighted Avg. Exercise Price		Weighted Avg. Remaining Contractual Life In Years		Aggregate Intrinsic Value
Stock options outstanding, December 31, 2017		5,148		$	22.65		4.87	$	6,109
Stock options granted		—		$	—
Stock options exercised		(24	)	$	15.48
Stock options forfeited		(27	)	$	16.59
Stock options expired		(58	)	$	26.87
Stock options outstanding, March 31, 2018		5,039		$	22.66		4.50	$	271
Stock options vested and expected to vest, March 31, 2018		5,039		$	22.66		4.50	$	271
Stock options exercisable, March 31, 2018		4,286		$	23.75		4.00	$	157

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table is a summary of our PSUs, RSUs and restricted stock outstanding as of December 31, 2017 and the changes that occurred during the three months ended March 31, 2018:

(In thousands, except per share amounts)	Number of Shares			Weighted Avg. Grant Date Fair Value
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2017		1,292		$	21.33
PSUs, RSUs and restricted stock granted		8		$	20.71
PSUs, RSUs and restricted stock vested		(5	)	$	20.00
PSUs, RSUs and restricted stock forfeited		(62	)	$	21.50
Unvested PSUs, RSUs and restricted stock outstanding, March 31, 2018		1,233		$	21.31