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Stockholders' Equity (Tables)
 9 Months Ended
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