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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity Note [Abstract]  
Restricted share activity
Activity for RSAs, PSAs and PSUs, for the six months ended June 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
346,491

 
—

 
211,969

 
558,460

 
73.43

Vested
(183,595
)
 
(32,929
)
 
—

 
(216,524
)
 
57.04

Forfeited
(124,690
)
 
(48,701
)
 
(101,320
)
 
(274,711
)
 
63.38

Unvested balance, June 30, 2018
440,010

 
3,132

 
202,477

 
645,619

 
69.69

The aggregate fair values of RSAs, PSAs and PSUs granted and vested are presented in the following table:
 
Six Months Ended June 30,
 
2018
 
2017
 
(In millions)
Granted:
 
 
 
Restricted stock awards
$
25

 
$
19

Performance stock units
16

 
16

 
$
41

 
$
35

Vested:
 
 
 
Restricted stock awards
$
14

 
$
20

Performance stock awards
3

 
15

Performance stock units
—

 
9

 
$
17

 
$
44