Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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		Nine Months Ended		Nine Months Ended
Income Statement Classifications	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Cost of services and maintenance revenues	$	617	$	567	$	1,876	$	1,524
Research and development	15,831		14,523		47,987		39,722
Sales, marketing and services	16,249		13,977		48,910		37,254
General and administrative	13,196		11,036		38,533		30,422
Total	$	45,893	$	40,103	$	137,306	$	108,922

Schedule of Assumptions Used to Value Option Grants

The assumptions used to value option grants are as follows:

	Three Months Ended		Nine Months Ended		Nine Months Ended
	September 30, 2012		September 30, 2013		September 30, 2012
Expected volatility factor	0.43		0.39		0.38 - 0.43
Approximate risk free interest rate	0.52	%	0.44	%	0.52% - 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	%