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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Restricted share activity
Activity for RSAs, PSAs and PSUs, for the nine months ended September 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
353,618

 
—

 
212,926

 
566,544

 
73.85

Vested
(188,954
)
 
(32,929
)
 
—

 
(221,883
)
 
57.87

Forfeited
(152,243
)
 
(48,701
)
 
(104,527
)
 
(305,471
)
 
63.67

Unvested balance, September 30, 2018
414,225

 
3,132

 
200,227

 
617,584

 
70.11

The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
 
Nine Months Ended September 30,
 
2018
 
2017
 
(In millions)
Granted:
 
 
 
Restricted stock awards
$
26

 
$
19

Performance stock units
16

 
16

 
$
42

 
$
35

Vested:
 
 
 
Restricted stock awards
$
14

 
$
21

Performance stock awards
3

 
15

Performance stock units
—

 
9

 
$
17

 
$
45