Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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		Six Months Ended		Six Months Ended
Income Statement Classifications	June 30, 2014		June 30, 2013		June 30, 2014		June 30, 2013
Cost of services and maintenance revenues	$	704	$	625	$	1,181	$	1,259
Research and development	15,333		16,503		28,113		32,156
Sales, marketing and services	15,796		17,487		31,812		32,661
General and administrative	13,457		13,242		24,885		25,337
Total	$	45,290	$	47,857	$	85,991	$	91,413

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	%