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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Stock Option Activity Under Equity-Based Plans | The following table summarizes stock option activity under our 2009 Plan for the nine months ended September 30, 2018:
| Number of Shares
Balance at December 31, 2017 | 1,296,863 |
Exercised | (540,292 | )
Forfeited | (17,846 | )
Balance at September 30, 2018 | 738,725 |
Exercisable at September 30, 2018 | 710,467 |
Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans | The following tables summarize RSU, performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the nine months ended September 30, 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 | 608,582 |  | 47.66 |  | 23,842 |  | 47.61 |
Vested | (800,560 | ) | 25.79 |  | (82,066 | ) | 33.51 |
Forfeited | (254,459 | ) | 27.25 |  | (65,557 | ) | 31.60 |
Nonvested at September 30, 2018 | 1,803,224 |  | $ | 31.77 |  | 329,893 |  | $ | 31.08 |
| 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 | 116,559 |  | 49.12 |  | 256,224 |  | 48.98 |
Vested | (9,122 | ) | 47.61 |  | — |  | — |
Nonvested at September 30, 2018 | 107,437 |  | $ | 49.25 |  | 256,224 |  | $ | 48.98 |
Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans | The following tables summarize RSU, performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the nine months ended September 30, 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 | 608,582 |  | 47.66 |  | 23,842 |  | 47.61 |
Vested | (800,560 | ) | 25.79 |  | (82,066 | ) | 33.51 |
Forfeited | (254,459 | ) | 27.25 |  | (65,557 | ) | 31.60 |
Nonvested at September 30, 2018 | 1,803,224 |  | $ | 31.77 |  | 329,893 |  | $ | 31.08 |
| 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 | 116,559 |  | 49.12 |  | 256,224 |  | 48.98 |
Vested | (9,122 | ) | 47.61 |  | — |  | — |
Nonvested at September 30, 2018 | 107,437 |  | $ | 49.25 |  | 256,224 |  | $ | 48.98 |
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) | 2018 | 2017 |  | 2018 | 2017
Cost of providing services | $ | 3 |  | $ | 2 |  |  | $ | 7 |  | $ | 6 |
Sales and marketing | 2 |  | 2 |  |  | 6 |  | 4 |
General and administrative | 6 |  | 3 |  |  | 15 |  | 8 |
Systems development and programming costs | 1 |  | 1 |  |  | 3 |  | 3 |
Total stock-based compensation expense | $ | 12 |  | $ | 8 |  |  | $ | 31 |  | $ | 21 |
Income tax benefit related to stock-based compensation expense | $ | 3 |  | $ | 3 |  |  | $ | 8 |  | $ | 8 |
Tax benefit realized from stock options exercised and similar awards | $ | 3 |  | $ | 6 |  |  | $ | 16 |  | $ | 22 |

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