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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
Restricted share activity | RSAs, PSAs and PSUs, for the three months ended March 31, 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 | 321,798 |  |  | — |  |  | 188,455 |  |  | 510,253 |  |  | 72.46 |
Vested | (163,043 | ) |  | (32,929 | ) |  | — |  |  | (195,972 | ) |  | 55.16 |
Forfeited | (59,931 | ) |  | (44,384 | ) |  | (47,650 | ) |  | (151,965 | ) |  | 62.99 |
Unvested balance, March 31, 2018 | 500,628 |  |  | 7,449 |  |  | 232,633 |  |  | 740,710 |  |  | 67.96 |
The total fair value of awards granted and vested is presented in the following table:
| Three Months Ended March 31,
| 2018 |  | 2017
| (In millions)
Granted: |  |  |
Restricted stock awards | $ | 23 |  |  | $ | 17 |
Performance stock units | 14 |  |  | — |
| $ | 37 |  |  | $ | 17 |
Vested: |  |  |
Restricted stock awards | $ | 12 |  |  | $ | 10 |
Performance stock awards | 3 |  |  | 6 |
| $ | 15 |  |  | $ | 16 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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