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Stockholders' Equity - (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Schedule of Common Stock
The following table presents a rollforward of our common stock for the three and nine months ended September 30, 2019 and 2018:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
2018
2019
2018
Shares issued and outstanding, beginning balance
69,991,145

70,573,887


70,596,559

69,818,392

Issuance of common stock from vested restricted stock units
198,478

255,268


699,188

1,255,409

Issuance of common stock from exercise of stock options
23,441

70,398


163,214

540,292

Issuance of common stock for employee stock purchase plan
—

—


112,623

84,525

Repurchase of common stock
(307,046
)
(300,900
)

(1,482,655
)
(895,699
)
Awards effectively repurchased for required employee withholding taxes
(71,765
)
(90,264
)

(254,676
)
(294,530
)
Shares issued and outstanding, ending balance
69,834,253

70,508,389


69,834,253

70,508,389


Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans
The following table summarizes RSU and RSA activity under our equity-based plans for the nine months ended September 30, 2019:
 
RSUs
 
RSAs
 
Number of Units
Weighted-Average
Grant Date
Fair Value
 
Number of Units
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2018
1,737,554

$
32.83

 
346,792

$
49.13

Granted
678,936

60.79

 
—

—

Vested
(710,291
)
31.12

 
(38,042
)
50.37

Forfeited
(147,622
)
37.55

 
(11,103
)
49.35

Nonvested at September 30, 2019
1,558,577

$
44.63

 
297,647

$
49.11


Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans
The following table summarizes RSU and RSA activity under our equity-based plans for the nine months ended September 30, 2019:
 
RSUs
 
RSAs
 
Number of Units
Weighted-Average
Grant Date
Fair Value
 
Number of Units
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2018
1,737,554

$
32.83

 
346,792

$
49.13

Granted
678,936

60.79

 
—

—

Vested
(710,291
)
31.12

 
(38,042
)
50.37

Forfeited
(147,622
)
37.55

 
(11,103
)
49.35

Nonvested at September 30, 2019
1,558,577

$
44.63

 
297,647

$
49.11


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 millions)
2019
2018
 
2019
2018
Cost of providing services
$
2

$
3

 
$
6

$
7

Sales and marketing
1

2

 
2

6

General and administrative
5

6

 
19

15

Systems development and programming costs
1

1

 
2

3

Total stock based compensation expense
$
9

$
12

 
$
29

$
31