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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the nine months ended September 30, 2018 is summarized as follows: 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2017
483,021

 
$
104.16

Granted
193,316

 
$
132.10

Forfeited
(19,184
)
 
$
135.56

Settled
(106,887
)
 
$
113.99

Outstanding at September 30, 2018
550,266

 
$
111.62
Summary of Stock Option Activity
Stock option activity for the nine months ended September 30, 2018 is summarized as follows: 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2017
109,808

 
$
16.44

Exercised
(23,675
)
 
$
30.38

Outstanding at September 30, 2018
86,133

 
$
12.61