Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 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		Nine Months Ended		Nine Months Ended
Income Statement Classifications	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
Cost of services and maintenance revenues	$	567	$	448	$	1,524	$	1,112
Research and development	14,523		9,599		39,722		21,465
Sales, marketing and services	13,977		8,434		37,254		21,618
General and administrative	11,036		6,473		30,422		19,396
Total	$	40,103	$	24,954	$	108,922	$	63,591

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		Nine Months Ended		Nine Months Ended
	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
Expected volatility factor	0.43		0.50		0.38 - 0.43		0.38 - 0.50
Approximate risk free interest rate	0.52	%	0.64	%	0.52% - 0.68%		0.64% - 1.10%
Expected term (in years)	3.91		3.27		3.91		3.27
Expected dividend yield	0	%	0	%	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	%