Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of 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, 2013		June 30, 2012		June 30, 2013		June 30, 2012
Cost of services and maintenance revenues	$	625	$	507	$	1,259	$	957
Research and development	16,503		14,055		32,156		25,199
Sales, marketing and services	17,487		13,307		32,661		23,277
General and administrative	13,242		10,393		25,337		19,386
Total	$	47,857	$	38,262	$	91,413	$	68,819

Schedule of Assumptions Used to Value Option Grants

The assumptions used to value option grants are as follows:



	Three Months Ended		Six Months Ended		Six Months Ended
	June 30, 2012		June 30, 2013		June 30, 2012
Expected volatility factor	0.41		0.39		0.38 - 0.41
Approximate risk free interest rate	0.68	%	0.44	%	0.65% - 0.68%
Expected term (in years)	3.91		3.35		3.91
Expected dividend yield	0	%	0	%	0	%

Schedule of Assumptions Used to Value Nonvested Share Grants

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	%