Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

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, 2014		September 30, 2013		September 30, 2014		September 30, 2013
Cost of services and maintenance revenues	$	673	$	617	$	1,854	$	1,876
Research and development	13,989		15,831		42,102		47,987
Sales, marketing and services	15,073		16,249		46,885		48,910
General and administrative	12,714		13,196		37,599		38,533
Total	$	42,449	$	45,893	$	128,440	$	137,306

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 2014 Grant		March 2013 Grant
Expected volatility factor	0.19 - 0.38		0.16 - 0.42
Risk free interest rate	0.81	%	0.33	%
Expected dividend yield	0	%	0	%