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Stockholders' Equity (Tables)
 3 Months Ended
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