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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity Note [Abstract] |
Restricted share activity | Activity for RSAs, PSAs and PSUs, for the six months ended June 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 | 346,491 |  |  | — |  |  | 211,969 |  |  | 558,460 |  |  | 73.43 |
Vested | (183,595 | ) |  | (32,929 | ) |  | — |  |  | (216,524 | ) |  | 57.04 |
Forfeited | (124,690 | ) |  | (48,701 | ) |  | (101,320 | ) |  | (274,711 | ) |  | 63.38 |
Unvested balance, June 30, 2018 | 440,010 |  |  | 3,132 |  |  | 202,477 |  |  | 645,619 |  |  | 69.69 |
The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
| Six Months Ended June 30,
| 2018 |  | 2017
| (In millions)
Granted: |  |  |
Restricted stock awards | $ | 25 |  |  | $ | 19 |
Performance stock units | 16 |  |  | 16 |
| $ | 41 |  |  | $ | 35 |
Vested: |  |  |
Restricted stock awards | $ | 14 |  |  | $ | 20 |
Performance stock awards | 3 |  |  | 15 |
Performance stock units | — |  |  | 9 |
| $ | 17 |  |  | $ | 44 |

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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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