Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense by income statement caption and the related income tax benefit were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2013		2012		2013		2012
Research and development	$	55	$	45	$	112	$	115
Selling, general and administrative:
Employees	1,149		890		2,258		1,812
Outside directors	96		205		191		410
Total stock-based compensation expense	$	1,300	$	1,140	$	2,561	$	2,337
Income tax benefit	$	415	$	360	$	804	$	767

Schedule of Stock Option Activity

Stock option activity was as follows:

	Number of Options (in 000's)		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Terms (in years)	Aggregate Intrinsic Value (in 000's)
Outstanding at December 31, 2012	1,412		$	20.56
Granted	201		19.68
Exercised	(273	)	14.44			$	2,703
Forfeited/canceled/expired	(7	)	28.08
Outstanding at June 30, 2013 (1)	1,333		$	21.64	5.72	$	8,799
Vested and expected to vest at June 30, 2013 (1)	1,329		$	21.65	5.70	$	8,763
Exercisable on June 30, 2013 (1)	989		$	21.89	4.60	$	6,279

⁽¹⁾  The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of the second quarter of 2013 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on June 30, 2013. This amount will change based on the fair market value of our stock.

Schedule of Black Scholes Assumptions

The assumptions we utilized in the Black-Scholes option pricing model and the resulting weighted average fair value of stock option grants were the following:

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Weighted average fair value of grants (1)	$	10.04		$	—	$	9.26		$	9.65
Risk-free interest rate	0.73		%	—		0.95		%	0.86		%
Expected volatility	52.38		%	—		53.39		%	55.25		%
Expected life in years	5.20			—		5.20			5.14

⁽¹⁾  The weighted average fair value of grants was calculated utilizing the stock options granted during each respective period.

Schedule of Non-vested Restricted Stock Awards Activity

Non-vested restricted stock award activity was as follows:

	Shares Granted (in 000’s)		Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2012	270		$	18.72
Granted	80		19.25
Vested	(72	)	20.74
Forfeited	—		—
Non-vested at June 30, 2013	278		18.34