Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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

Share-based compensation expense

The following table summarizes total share-based compensation expense included in the Condensed Consolidated Statement of Operations (in thousands):

	Three Months Ended
	March 31,
	2013			2012
Cost of revenues	$	244		$	284
Research and development	652			745
Selling, general and administrative	723			753
Pre-tax share-based compensation expense	1,619			1,782
Less income tax effect	(550		)	(626		)
Net share-based compensation expense	$	1,069		$	1,156

Stock options granted under the Company's option plans

The fair value of the Company’s stock options granted under the Company’s option plans was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Three Months Ended
	March 31,
	2013		2012
Expected term (years)	5.9		5.8
Stock volatility	33.5	%	36.5	%
Risk free interest rates	1.0	%	1.3	%
Dividends during expected terms	1.6	%	1.6	%