Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2018 and 2017, which was recognized as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(In thousands)	2018			2017			2018			2017
Stock-based compensation expense included in cost of sales	$	102		$	93		$	197		$	184
Selling, general and administrative expense		995			1,008			2,030			2,024
Research and development expense		687			755			1,376			1,531
Stock-based compensation expense included in operating expenses		1,682			1,763			3,406			3,555
Total stock-based compensation expense		1,784			1,856			3,603			3,739
Tax benefit for expense associated with non-qualified options, PSUs, RSUs and restricted stock		(340	)		(433	)		(724	)		(813	)
Total stock-based compensation expense, net of tax	$	1,444		$	1,423		$	2,879		$	2,926

Summary of Stock Options Outstanding

The following table is a summary of our stock options outstanding as of December 31, 2017 and June 30, 2018 and the changes that occurred during the six months ended June 30, 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		(42	)	$	16.54
Stock options expired		(282	)	$	25.63
Stock options outstanding, June 30, 2018		4,800		$	22.56		4.39	$	—
Stock options vested and expected to vest, June 30, 2018		4,800		$	22.56		4.39	$	—
Stock options exercisable, June 30, 2018		4,063		$	23.67		3.90	$	—

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 six months ended June 30, 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		$	20.68
PSUs, RSUs and restricted stock vested		(7	)	$	19.99
PSUs, RSUs and restricted stock forfeited		(105	)	$	21.59
Unvested PSUs, RSUs and restricted stock outstanding, June 30, 2018		1,188		$	21.31