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Stockholders' Equity - (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2020 and 2019:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2020 | 2019 | 2020 | 2019
Shares issued and outstanding, beginning balance | 68,470,050 |  | 70,079,747 |  |  | 69,065,491 |  | 70,596,559 |
Issuance of common stock from vested restricted stock units | 168,621 |  | 213,991 |  |  | 342,250 |  | 500,710 |
Issuance of common stock from exercise of stock options | 11,136 |  | 58,491 |  |  | 40,609 |  | 139,773 |
Issuance of common stock for employee stock purchase plan | 130,532 |  | 112,623 |  |  | 130,532 |  | 112,623 |
Repurchase of common stock | (1,419,984 | ) | (392,700 | ) |  | (2,167,401 | ) | (1,175,609 | )
Awards effectively repurchased for required employee withholding taxes | (67,491 | ) | (81,007 | ) |  | (118,617 | ) | (182,911 | )
Shares issued and outstanding, ending balance | 67,292,864 |  | 69,991,145 |  |  | 67,292,864 |  | 69,991,145 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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