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Stock-Based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2020

Effect of Recording Stock-Based Compensation Expense

The effect of recording stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 is as follows (in thousands):

		Years Ended December 31,
		2020				2019				2018
Cost of licensing, services and software revenue, excluding depreciation and amortization of intangible assets		$	781			$	—			$	—
Research, development and other related costs			13,592				14,643				13,168
Selling, general and administrative			24,762				16,911				17,843
Total stock-based compensation expense			39,135				31,554				31,011
Tax effect on stock-based compensation expense			(2,116	)			(5,051	)			(4,869	)
Net effect on net income (loss)		$	37,019			$	26,503			$	26,142

Stock-Based Compensation Expense Categorized by Equity Components

Stock-based compensation expense categorized by various equity components for the years ended December 31, 2020, 2019 and 2018 is summarized in the table below (in thousands):

		Years Ended December 31,
		2020				2019				2018
Restricted stock awards and units		$	36,451			$	29,031			$	27,974
Employee stock purchase plan			2,613				2,304				2,599
Employee stock options			71				219				438
Total stock-based compensation expense		$	39,135			$	31,554			$	31,011

Employee Stock Purchase Plan

Schedule of Assumptions Used to Value Options Granted

The following assumptions were used to value the ESPP shares:

		Years Ended December 31,
		2020				2019				2018
Expected life (years)			2.0				2.0				2.0
Risk-free interest rate		0.1 - 1.4%				1.7 - 2.5%				2.2 - 2.7%
Dividend yield		1.4 - 4.0%				3.5 - 5.4%				3.6 - 3.9%
Expected volatility		45.8 - 57.5%				51.7 - 53.4%				39.4 - 41.7%

Performance Stock Units

Schedule of Assumptions Used to Value Options Granted

The following assumptions were used to value the performance stock units subject to market conditions granted in the year ended December 31, 2020:

		Year Ended December 31, 2020
Expected life (years)			3.0
Risk-free interest rate			0.2	%
Dividend yield			1.4	%
Expected volatility			51.3	%

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