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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Stockholders' Equity Note [Abstract] |
Restricted share activity | Activity for RSAs, performance stock awards (“PSAs”) and PSUs, for the three months ended March 31, 2019, 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 | 215,178 |  |  | — |  |  | 138,994 |  |  | 354,172 |  |  | 137.37 |
Vested | (119,994 | ) |  | (3,132 | ) |  | (10,528 | ) |  | (133,654 | ) |  | 68.24 |
Forfeited | (14,220 | ) |  | — |  |  | (4,140 | ) |  | (18,360 | ) |  | 74.03 |
Unvested balance, March 31, 2019 | 480,759 |  |  | — |  |  | 325,709 |  |  | 806,468 |  |  | 100.91 |
The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
| Three Months Ended March 31,
| 2019 |  | 2018
| (In millions)
Granted: |  |  |
RSAs | $ | 30 |  |  | $ | 23 |
PSUs | 18 |  |  | 14 |
| $ | 48 |  |  | $ | 37 |
Vested: |  |  |
RSAs | $ | 16 |  |  | $ | 12 |
PSUs | 2 |  |  | — |
PSAs | — |  |  | 3 |
| $ | 18 |  |  | $ | 15 |

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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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