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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the six months ended June 30, 2017 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2016
302,824

 
$
111.56

Granted
272,399

 
$
107.31

Forfeited
(28,776
)
 
$
121.18

Settled
(68,930
)
 
$
138.35

Outstanding at June 30, 2017
477,517

 
$
104.69
Summary of Stock Option Activity
Stock option activity for the six months ended June 30, 2017 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2016
137,157

 
$
17.77

Granted
—

 
$
—

Exercised
(26,149
)
 
$
23.25

Forfeited
—

 
$
—

Outstanding at June 30, 2017
111,008

 
$
16.48