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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
STOCKHOLDERS' EQUITY | STOCKHOLDERS’ EQUITY Equity-Based Incentive Plans Our 2009 Equity Incentive Plan (2009 Plan) provides for the grant of stock awards, including stock options, restricted stock units (time-based and performance-based), restricted stock awards (time-based and performance-based) and other equity awards. The number of shares available for grant under this 2009 Plan as of March 31, 2018 was approximately 11 million. The following table summarizes stock option activity under our 2009 Plan for the three months ended March 31, 2018:
| Number of Shares
Balance at December 31, 2017 | 1,296,863 |
Exercised | (206,430 | )
Forfeited | (4,167 | )
Balance at March 31, 2018 | 1,086,266 |
Exercisable at March 31, 2018 | 1,011,038 |
The aggregate intrinsic value of stock options outstanding was $37 million and $41 million as of March 31, 2018 and December 31, 2017, respectively. In March 2018, the Equity Award Committee of the Compensation Committee granted awards of time-based restricted stock (RSAs) and performance-based restricted stock (PRSAs) to the Company's named executive officers (as defined in Item 402(a)(3) of Regulation S-K promulgated by the Securities and Exchange Commission). A recipient of RSAs owns the underlying shares of common stock upon grant and some of the benefits of ownership, such as voting and dividend rights, but the recipient may not sell those shares and realize any value on a sale, until all time-based and performance-based restrictions have been satisfied or lapsed. Our RSAs granted in March 2018 are eligible to vest in equal installments on a quarterly basis over four years, subject to continued employment through the applicable vesting dates. The PRSAs are earned based on the extent to which the Company meets or exceeds certain annual growth rate percentages. Our PRSAs granted in March 2018 are designed with a single-year performance period subject to subsequent multi-year vesting requirements. Fifty percent of the shares earned (if any) during performance period (January 1, 2018 to December 31, 2018) will vest on December 31, 2019 and the remaining shares earned (if any) will vest on December 31, 2020. The following tables summarize restricted stock unit (RSU), performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the three months ended March 31, 2018:
| RSUs | PSUs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | 2,249,661 |  | $ | 24.83 |  | 453,674 |  | $ | 30.72 |
Granted | 548,054 |  | 46.97 |  | 23,842 |  | 47.61 |
Vested | (286,121 | ) | 23.96 |  | (82,066 | ) | 33.51 |
Forfeited | (88,396 | ) | 25.51 |  | — |  | — |
Nonvested at March 31, 2018 | 2,423,198 |  | $ | 29.91 |  | 395,450 |  | $ | 30.89 |
| RSAs | PRSAs
| Number of Units | Weighted-Average Grant Date Fair Value | Number of Units | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | — |  | $ | — |  | — |  | $ | — |
Granted | 72,991 |  | 47.61 |  | 169,088 |  | 47.61 |
Nonvested at March 31, 2018 | 72,991 |  | $ | 47.61 |  | 169,088 |  | $ | 47.61 |
Stock-Based Compensation Stock-based compensation expense is measured based on the fair value of the stock option on the grant date and recognized over the requisite service period for each separately vesting portion of the stock option 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 March 31,
(in millions) | 2018 | 2017
Cost of providing services | $ | 2 |  | $ | 2 |
Sales and marketing | 2 |  | 1 |
General and administrative | 4 |  | 2 |
Systems development and programming costs | 1 |  | 1 |
Total stock-based compensation expense | $ | 9 |  | $ | 6 |
Income tax benefit related to stock-based compensation expense | $ | 2 |  | $ | 2 |
Tax benefit realized from stock options exercised and similar awards | $ | 6 |  | $ | 6 |
Stock Repurchases The board of directors authorizes repurchases through an ongoing program initiated in May 2014. During the three months ended March 31, 2018, we repurchased 160,033 shares of common stock for approximately $8 million. As of March 31, 2018, approximately $129 million remained available for further repurchases of our common stock under our ongoing stock repurchase program under all authorizations from our board of directors.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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