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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017:
 
Number
of Shares
Balance at December 31, 2016
2,815,224

Granted
—

Exercised
(1,280,726
)
Cancelled
(12,297
)
Forfeited
(57,540
)
Expired
—

Balance at September 30, 2017
1,464,661

Exercisable at September 30, 2017
1,192,694
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 nine months ended September 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
1,119,525

28.68

330,674

29.69

Vested
(795,856
)
20.41

(7,518
)
33.51

Forfeited
(232,727
)
23.38

(18,894
)
33.51

Nonvested at September 30, 2017
2,413,993

$
23.87

453,674

$
30.72
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 nine months ended September 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
1,119,525

28.68

330,674

29.69

Vested
(795,856
)
20.41

(7,518
)
33.51

Forfeited
(232,727
)
23.38

(18,894
)
33.51

Nonvested at September 30, 2017
2,413,993

$
23.87

453,674

$
30.72
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
September 30,
 
Nine Months Ended
September 30,
(in thousands)
2017
2016
 
2017
2016
Cost of providing services
$
1,845

$
1,605

 
$
5,488

$
5,044

Sales and marketing
1,524

1,491

 
4,447

5,119

General and administrative
3,259

2,544

 
8,294

8,161

Systems development and programming costs
1,072

624

 
3,177

1,845

Total stock-based compensation expense
$
7,700

$
6,264

 
$
21,406

$
20,169

Income tax benefit related to stock-based compensation expense
$
2,813

$
2,267

 
$
7,621

$
7,095

Tax benefit realized from stock options exercised and similar awards
$
5,942

$
1,721

 
$
21,976

$
4,136