Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The Company used the Black-Scholes model to estimate the fair value of its Employee Stock Purchase Plan awards with the following weighted-average assumptions:

	Three Months Ended
	March 31, 2016
Expected volatility factor	0.41
Risk free interest rate	0.35	%
Expected dividend yield	0	%
Expected life (in years)	0.5

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
Income Statement Classifications	March 31, 2016		March 31, 2015
Cost of services and maintenance revenues	$	770	$	550
Research and development	10,076		13,257
Sales, marketing and services	12,390		10,696
General and administrative	18,861		9,708
Total	$	42,097	$	34,211

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 2016 Grant		January 2016 Grant		March 2015 Grant
Expected volatility factor	0.29 - 0.39		0.29 - 0.37		0.14 - 0.29
Risk free interest rate	0.91	%	1.10	%	0.85	%
Expected dividend yield	0	%	0	%	0	%