Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [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 2015 ESPP awards with the following weighted-average assumptions:

	Six Months Ended
	June 30, 2019	June 30, 2018
Expected volatility factor	0.26 - 0.29	0.27 - 0.29
Risk free interest rate	2.19% - 2.49%	1.12% - 1.63%
Expected dividend yield	1.27% - 1.31%	0	%
Expected life (in years)	0.5	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				Six Months Ended
Income Statement Classifications	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Cost of subscription, support and services	$	2,956	$	2,241	$	5,158	$	3,721
Research and development	25,419		17,715		53,256		28,508
Sales, marketing and services	24,424		19,618		44,350		33,185
General and administrative	15,521		16,270		30,790		26,153
Total	$	68,320	$	55,844	$	133,554	$	91,567

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 2017 Grant (Modified)		March 2017 Grant
Expected volatility factor	0.16-0.32		0.27-0.32
Risk free interest rate	2.67	%	1.48	%
Expected dividend yield	0	%	0	%