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Stockholders' Equity - (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Schedule of Common Stock | The following table presents a rollforward of our common stock for the three and six months ended June 30, 2019 and 2018:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 | 2018 | 2019 | 2018
Shares issued and outstanding, beginning balance | 70,079,747 |  | 70,363,251 |  |  | 70,596,559 |  | 69,818,392 |
Issuance of common stock from vested restricted stock units | 213,991 |  | 389,875 |  |  | 500,710 |  | 1,000,141 |
Issuance of common stock from exercise of stock options | 58,491 |  | 263,464 |  |  | 139,773 |  | 469,894 |
Issuance of common stock for employee stock purchase plan | 112,623 |  | 84,525 |  |  | 112,623 |  | 84,525 |
Repurchase of common stock | (392,700 | ) | (434,766 | ) |  | (1,175,609 | ) | (594,799 | )
Awards effectively repurchased for required employee withholding taxes | (81,007 | ) | (92,462 | ) |  | (182,911 | ) | (204,266 | )
Shares issued and outstanding, ending balance | 69,991,145 |  | 70,573,887 |  |  | 69,991,145 |  | 70,573,887 |
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 six months ended June 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 | 724,172 |  | 60.58 |  | — |  | — |
Vested | (511,813 | ) | 30.34 |  | (31,248 | ) | 50.61 |
Forfeited | (106,737 | ) | 36.52 |  | (11,103 | ) | 49.35 |
Nonvested at June 30, 2019 | 1,843,176 |  | $ | 44.18 |  | 304,441 |  | $ | 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 six months ended June 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 | 724,172 |  | 60.58 |  | — |  | — |
Vested | (511,813 | ) | 30.34 |  | (31,248 | ) | 50.61 |
Forfeited | (106,737 | ) | 36.52 |  | (11,103 | ) | 49.35 |
Nonvested at June 30, 2019 | 1,843,176 |  | $ | 44.18 |  | 304,441 |  | $ | 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 June 30, |  | Six Months Ended June 30,
(in millions) | 2019 | 2018 |  | 2019 | 2018
Cost of providing services | $ | 2 |  | $ | 2 |  |  | $ | 4 |  | $ | 4 |
Sales and marketing | 1 |  | 2 |  |  | 1 |  | 4 |
General and administrative | 7 |  | 5 |  |  | 13 |  | 9 |
Systems development and programming costs | 1 |  | 1 |  |  | 2 |  | 2 |
Total stock-based compensation expense | $ | 11 |  | $ | 10 |  |  | $ | 20 |  | $ | 19 |

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