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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2017:
 
Number
of Shares
Balance at December 31, 2016
2,815,224

Granted
—

Exercised
(1,041,720
)
Forfeited
(53,413
)
Expired
—

Balance at June 30, 2017
1,720,091

Exercisable at June 30, 2017
1,320,866
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 six months ended June 30, 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
966,329

27.88

239,792

28.43

Vested
(549,248
)
19.46

(7,518
)
33.51

Forfeited
(147,674
)
23.25

(18,894
)
33.51

Nonvested at June 30, 2017
2,592,458

$
23.15

362,792

$
30.15
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 six months ended June 30, 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
966,329

27.88

239,792

28.43

Vested
(549,248
)
19.46

(7,518
)
33.51

Forfeited
(147,674
)
23.25

(18,894
)
33.51

Nonvested at June 30, 2017
2,592,458

$
23.15

362,792

$
30.15
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
June 30,
 
Six Months Ended
June 30,
(in thousands)
2017
2016
 
2017
2016
Cost of providing services
$
2,031

$
1,624

 
$
3,643

$
3,439

Sales and marketing
1,621

1,643

 
2,923

3,628

General and administrative
2,744

2,644

 
5,035

5,617

Systems development and programming costs
1,103

597

 
2,105

1,221

Total stock-based compensation expense
$
7,499

$
6,508

 
$
13,706

$
13,905

Income tax benefit related to stock-based compensation expense
$
2,682

$
2,248

 
$
4,808

$
4,828

Tax benefit realized from stock options exercised and similar awards
$
10,525

$
427

 
$
16,034

$
2,415