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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Restricted share activity
RSAs, PSAs and PSUs, for the three months ended March 31, 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
321,798

 
—

 
188,455

 
510,253

 
72.46

Vested
(163,043
)
 
(32,929
)
 
—

 
(195,972
)
 
55.16

Forfeited
(59,931
)
 
(44,384
)
 
(47,650
)
 
(151,965
)
 
62.99

Unvested balance, March 31, 2018
500,628

 
7,449

 
232,633

 
740,710

 
67.96

The total fair value of awards granted and vested is presented in the following table:
 
Three Months Ended March 31,
 
2018
 
2017
 
(In millions)
Granted:
 
 
 
Restricted stock awards
$
23

 
$
17

Performance stock units
14

 
—

 
$
37

 
$
17

Vested:
 
 
 
Restricted stock awards
$
12

 
$
10

Performance stock awards
3

 
6

 
$
15

 
$
16