Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013		March 31, 2012
Cost of services and maintenance revenues	$	634	$	450
Research and development	15,653		11,144
Sales, marketing and services	15,174		9,970
General and administrative	12,095		8,993
Total	$	43,556	$	30,557

Assumptions Used To Value Option Grants

The assumptions used to value option grants are as follows:

	Three Months Ended		Three Months Ended
	March 31, 2013		March 31, 2012
Expected volatility factor	0.39		0.38
Approximate risk free interest rate	0.44	%	0.65	%
Expected term (in years)	3.35		3.91
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:

	March 2013 Grant		March 2012 Grant
Expected volatility factor	0.16 - 0.42		0.21 - 0.39
Risk free interest rate	0.33	%	0.47	%
Expected dividend yield	0	%	0	%