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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity
activity is presented in the following tables.
 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of March 31, 2018
658.0

 
$
126.31

2.20
Granted
100.7

 
164.04

 
Vested
(4.3
)
 
172.95

 
Forfeited
(4.1
)
 
129.03

 
Unvested as of June 30, 2018
750.3

 
$
131.09

2.36
 
 
 
 
 
Unvested as of March 31, 2017
785.7

 
$
117.62

1.82
Granted
11.1

 
118.00

 
Vested
(3.3
)
 
117.81

 
Forfeited
(17.6
)
 
112.71

 
Unvested as of June 30, 2017
775.9

 
$
117.74

1.61

 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of December 31, 2017
727.7

 
$
118.96

1.24
Granted
220.0

 
162.33

 
Vested
(178.1
)
 
122.42

 
Forfeited
(19.3
)
 
125.56

 
Unvested as of June 30, 2018
750.3

 
$
131.09

2.36
 
 
 
 
 
Unvested as of December 31, 2016
750.9

 
$
113.97

1.71
Granted
151.9

 
116.54

 
Vested
(106.4
)
 
90.32

 
Forfeited
(20.5
)
 
113.16

 
Unvested as of June 30, 2017
775.9

 
$
117.74

1.61