Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Summary of Stock Option Activity under the Company's Equity-Based Plans

The following table summarizes stock option activity under our equity-based plans for the three months ended March 31, 2017:

	Number of Shares
Balance at December 31, 2016	2,815,224
Granted	—
Exercised	(349,264	)
Forfeited	(20,174	)
Expired	—
Balance at March 31, 2017	2,445,786
Exercisable at March 31, 2017	1,872,720

Summary of Restricted Stock Unit Activity under the Company's Equity-Based Plans

The following table summarizes restricted stock unit (RSU) and performance-based restricted stock unit (PSU) activity under our equity-based plans for the three months ended March 31, 2017:

	RSUs				PSUs
	Number of Units		Weighted-Average Grant Date Fair Value		Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2016	2,323,051		$	20.32	149,412		$	33.51
Granted	842,909		27.89		239,792		28.43
Vested	(320,751	)	17.47		(7,518	)	33.51
Forfeited	(42,235	)	22.90		—		—
Nonvested at March 31, 2017	2,802,974		$	22.88	381,686		$	30.32

Summary of Performance Based Restricted Stock Unit Activity

The following table summarizes restricted stock unit (RSU) and performance-based restricted stock unit (PSU) activity under our equity-based plans for the three months ended March 31, 2017:

	RSUs				PSUs
	Number of Units		Weighted-Average Grant Date Fair Value		Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2016	2,323,051		$	20.32	149,412		$	33.51
Granted	842,909		27.89		239,792		28.43
Vested	(320,751	)	17.47		(7,518	)	33.51
Forfeited	(42,235	)	22.90		—		—
Nonvested at March 31, 2017	2,802,974		$	22.88	381,686		$	30.32

Summary of Stock-based Compensation Expense

Stock-based compensation expense and other disclosures for stock-based awards made to our employees pursuant to the equity plans was as follows: 

	Three Months Ended March 31,
(in thousands)	2017		2016
Cost of providing services	$	1,612	$	1,815
Sales and marketing	1,302		1,985
General and administrative	2,291		2,974
Systems development and programming costs	1,002		623
Total stock-based compensation expense	$	6,207	$	7,397
Income tax benefit related to stock-based compensation expense	$	2,127	$	2,580
Actual tax benefit realized from stock options exercised	$	5,509	$	1,988