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Stockholders' Equity - (Tables) | 9 Months Ended
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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 |

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