Employee Stock-Based Compensation and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions Used To Value Option Grants

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:

	Year Ended		Year Ended
	December 31, 2016		December 31, 2015
Expected volatility factor	0.27-0.41		0.35
Risk free interest rate	0.25%-0.42%		0.25	%
Expected dividend yield	0	%	0	%
Expected life (in years)	0.5		0.5

Detail Of The 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):

Income Statement Classifications	2016		2015		2014
Cost of services and maintenance revenues	$	3,433	$	2,940	$	2,560
Research and development	49,290		47,723		55,560
Sales, marketing and services	54,785		49,315		61,925
General and administrative	77,280		47,390		49,242
Total	$	184,788	$	147,368	$	169,287

Schedule of Nonvested Stock Unit Activity

The following table summarizes the Company's non-vested stock unit activity for the year ended December 31, 2016:

	Number of Shares		Weighted- Average Fair Value at Grant Date
Non-vested stock units at December 31, 2015	5,147,926		$	65.00
Granted	2,538,589		76.27
Vested	(2,472,217	)	66.25
Forfeited	(822,462	)	65.59
Non-vested stock units at December 31, 2016	4,391,836		70.67

Non-vested stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions Used To Value Option 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		March 2014 Grant
Expected volatility factor	0.29 - 0.39		0.29 - 0.37		0.14 - 0.29		0.19 - 0.38
Risk free interest rate	0.91	%	1.10	%	0.85	%	0.81	%
Expected dividend yield	0	%	0	%	0	%	0	%