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Stockholders' Equity - (Notes)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
STOCKHOLDERS' EQUITY STOCKHOLDERS’ EQUITY
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


Equity-Based Incentive Plans
Our 2019 Equity Incentive Plan (the 2019 Plan), approved in May 2019, replaced our 2009 Equity Incentive Plan and provides for the grants of options (both non-qualified and incentive stock options), stock appreciation rights, restricted stock, RSUs, performance awards (each as defined in the 2019 Plan) and other cash and stock based awards. Shares available for grant as of September 30, 2019 were 2,920,251.
Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs)
Time-based RSUs and RSAs generally vest over 4 years. Performance-based RSUs and RSAs are subject to vesting requirements based on certain financial performance metrics as defined in the grant notice. Actual number of shares earned may range from 0% to 200% of the target award. Awards granted in 2019 and 2018 are based on a single-year performance period subject to subsequent multi-year vesting with 50% of the shares earned vesting in 1 year after the performance period and the remaining shares in the year after.
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
Stock based compensation expense is measured based on the fair value of the stock award on the grant date and recognized over the requisite service period for each separately vesting portion of the stock award. 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


Stock Repurchases
In February 2019, our board of directors authorized a $300 million incremental increase to our ongoing stock repurchase program initiated in May 2014. During the nine months ended September 30, 2019, we repurchased 1,482,655 shares of common stock for approximately $84 million. As of September 30, 2019, approximately $292 million remained available for further repurchases of our common stock under all authorizations from our board of directors under this program.