Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Share-based Compensation [Abstract]

Detail Of The Total Stock-Based Compensation Recognized By Income Statement Classification

The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands):

	Three Months Ended		Three Months Ended
Income Statement Classifications	March 31, 2012		March 31, 2011
Cost of services and maintenance revenues	$	450	$	268
Research and development	11,144		5,685
Sales, marketing and services	9,970		6,032
General and administrative	8,993		5,899
Total	$	30,557	$	17,884

Assumptions Used To Value Option Grants

The assumptions used to value option grants under the 2005 Plan are as follows:

	Three Months Ended		Three Months Ended
	March 31, 2012		March 31, 2011
Expected volatility factor	0.38		0.39
Approximate risk free interest rate	0.65	%	1.10	%
Expected term (in years)	3.91		3.27
Expected dividend yield	0	%	0	%

Fair Value of the Non-Vested Performance Stock Unit Awards, Valuation Assumptions

The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows:

Expected volatility factor	0.21 - 0.39
Risk free interest rate	0.47	%
Expected dividend yield	0	%