Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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		Six Months Ended		Six Months Ended
Income Statement Classifications	June 30, 2012		June 30, 2011		June 30, 2012		June 30, 2011
Cost of services and maintenance revenues	$	507	$	396	$	957	$	664
Research and development	14,055		6,181		25,199		11,866
Sales, marketing and services	13,307		7,152		23,277		13,184
General and administrative	10,393		7,024		19,386		12,923
Total	$	38,262	$	20,753	$	68,819	$	38,637

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		Six Months Ended		Six Months Ended
	June 30, 2012		June 30, 2011		June 30, 2012		June 30, 2011
Expected volatility factor	0.41		0.38		0.38 - 0.41		0.38 - 0.39
Approximate risk free interest rate	0.68	%	1.03	%	0.65% - 0.68%		1.03% - 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	%