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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Restricted share activity | Activity for RSAs, PSAs and PSUs, for the nine months ended September 30, 2018, is summarized below:
| Restricted Stock Awards |  | Performance Stock Awards |  | Performance Stock Units |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2017 | 401,804 |  |  | 84,762 |  |  | 91,828 |  |  | 578,394 |  |  | $ | 58.35 |
Granted | 353,618 |  |  | — |  |  | 212,926 |  |  | 566,544 |  |  | 73.85 |
Vested | (188,954 | ) |  | (32,929 | ) |  | — |  |  | (221,883 | ) |  | 57.87 |
Forfeited | (152,243 | ) |  | (48,701 | ) |  | (104,527 | ) |  | (305,471 | ) |  | 63.67 |
Unvested balance, September 30, 2018 | 414,225 |  |  | 3,132 |  |  | 200,227 |  |  | 617,584 |  |  | 70.11 |
The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
| Nine Months Ended September 30,
| 2018 |  | 2017
| (In millions)
Granted: |  |  |
Restricted stock awards | $ | 26 |  |  | $ | 19 |
Performance stock units | 16 |  |  | 16 |
| $ | 42 |  |  | $ | 35 |
Vested: |  |  |
Restricted stock awards | $ | 14 |  |  | $ | 21 |
Performance stock awards | 3 |  |  | 15 |
Performance stock units | — |  |  | 9 |
| $ | 17 |  |  | $ | 45 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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