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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Restricted Share Activity | Activity for RSAs, performance stock awards (“PSAs”) and PSUs is summarized below:
| RSAs |  | PSAs |  | PSUs |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2018 | 399,795 |  |  | 3,132 |  |  | 201,383 |  |  | 604,310 |  |  | $ | 71.50 |
Granted | 228,902 |  |  | — |  |  | 141,828 |  |  | 370,730 |  |  | 137.53 |
Vested | (133,828 | ) |  | (3,132 | ) |  | (10,528 | ) |  | (147,488 | ) |  | 72.21 |
Forfeited | (46,780 | ) |  | — |  |  | (11,616 | ) |  | (58,396 | ) |  | 87.99 |
Unvested balance, September 30, 2019 | 448,089 |  |  | — |  |  | 321,067 |  |  | 769,156 |  |  | $ | 101.93 |
The aggregate fair values of RSAs, PSUs and PSAs granted and vested are presented in the following table:
| Nine Months Ended September 30,
| 2019 |  | 2018
| (In millions)
Granted: |  |  |
RSAs | $ | 32 |  |  | $ | 26 |
PSUs | 19 |  |  | 16 |
Total granted | $ | 51 |  |  | $ | 42 |
Vested: |  |  |
RSAs | $ | 18 |  |  | $ | 14 |
PSUs | 2 |  |  | — |
PSAs | — |  |  | 3 |
Total vested | $ | 20 |  |  | $ | 17 |

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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=116856206&loc=d3e5070-113901 + Details
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